.version.understanding_physics_optics___modern_physics{color:#000019;background-color:#FE6830;}#page{z-index:1;width:960px;min-height:2523px;background-image:none;border-width:0px;border-color:#000000;background-color:transparent;margin-left:auto;margin-right:auto;}#ppslideshowu15919{z-index:0;width:0.01px;padding-bottom:0px;margin-right:-10000px;margin-top:10px;margin-left:-100px;}#pslideshowu15919{z-index:2;width:0.01px;}#slideshowu15919{z-index:2;width:0.01px;height:456px;position:relative;margin-right:-10000px;margin-top:140px;}#u15931{position:absolute;width:1160px;height:456px;}#u15931popup{z-index:3;}#u15932{z-index:4;width:1160px;height:456px;margin-right:-10000px;position:relative;}#u20137{z-index:6;width:1160px;height:456px;margin-right:-10000px;position:relative;}#u20157{z-index:8;width:1160px;height:456px;margin-right:-10000px;position:relative;}#u13459{z-index:30;min-height:29px;padding-bottom:6px;}#menuu16918{z-index:48;width:549px;height:23px;position:relative;margin-right:-10000px;margin-top:6px;left:108px;}#u16919{width:135px;min-height:23px;position:relative;margin-right:-10000px;}#u16922{width:135px;padding-bottom:7px;position:relative;}#u16922.MuseMenuActive{width:135px;min-height:0px;margin:0px;}#u16925-4{width:121px;min-height:16px;position:relative;margin-right:-10000px;top:3px;}#u16922.MuseMenuActive #u16925-4{padding-top:0px;padding-bottom:0px;min-height:16px;width:121px;margin:0px -10000px 0px 0px;}#u16923{z-index:55;width:14px;height:14px;position:relative;margin-right:-10000px;top:4px;left:121px;}#u16920{width:234px;top:23px;}#u16921{width:234px;position:relative;}#u16921:hover{width:234px;min-height:0px;margin:0px;}#u17058{width:234px;position:relative;}#u17060{width:234px;padding-bottom:17px;position:relative;margin-right:-10000px;}#u17060:hover{width:234px;min-height:0px;margin:0px -10000px 0px 0px;}#u17060.MuseMenuActive{width:234px;min-height:0px;margin:0px -10000px 0px 0px;}#u17064-4{width:226px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:8px;left:2px;}#u17060:hover #u17064-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:226px;margin:0px -10000px 0px 0px;}#u17060.MuseMenuActive #u17064-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:226px;margin:0px -10000px 0px 0px;}#u16926{width:136px;min-height:23px;position:relative;margin-right:-10000px;left:137px;}#u16927{width:136px;padding-bottom:7px;position:relative;}#u16930-4{width:122px;min-height:16px;position:relative;margin-right:-10000px;top:3px;}#u16927.MuseMenuActive #u16930-4{padding-top:0px;padding-bottom:0px;min-height:16px;width:122px;margin:0px -10000px 0px 0px;}#u16928{z-index:70;width:14px;height:14px;position:relative;margin-right:-10000px;top:4px;left:122px;}#u16922.MuseMenuActive #u16923,#u16927.MuseMenuActive #u16928{width:14px;height:14px;min-height:0px;margin:0px -10000px 0px 0px;}#u16931{width:514px;top:23px;}#u17123{width:514px;padding-bottom:25px;position:relative;margin-right:-10000px;}#u17123:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u17127-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:12px;left:2px;}#u17123:hover #u17127-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u17143{width:514px;padding-bottom:22px;position:relative;margin-right:-10000px;}#u17123.MuseMenuActive,#u17143:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u17146-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:11px;left:2px;}#u17123.MuseMenuActive #u17127-4,#u17143:hover #u17146-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u18885{width:514px;padding-bottom:18px;position:relative;margin-right:-10000px;}#u17143.MuseMenuActive,#u18885:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u18888-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:9px;left:2px;}#u17143.MuseMenuActive #u17146-4,#u18885:hover #u18888-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u19068{width:514px;padding-bottom:15px;position:relative;margin-right:-10000px;}#u18885.MuseMenuActive,#u19068:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u19069-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:7px;left:2px;}#u18885.MuseMenuActive #u18888-4,#u19068:hover #u19069-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u19192{width:514px;padding-bottom:18px;position:relative;margin-right:-10000px;}#u19068.MuseMenuActive,#u19192:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u19195-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:9px;left:2px;}#u19068.MuseMenuActive #u19069-4,#u19192:hover #u19195-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u19309{width:514px;padding-bottom:17px;position:relative;margin-right:-10000px;}#u19192.MuseMenuActive,#u19309:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u19312-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:8px;left:2px;}#u19192.MuseMenuActive #u19195-4,#u19309:hover #u19312-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u16932,#u17121,#u17142,#u18884,#u19067,#u19191,#u19306,#u19430{width:514px;position:relative;}#u19431{width:514px;padding-bottom:20px;position:relative;margin-right:-10000px;}#u19309.MuseMenuActive,#u19431:hover{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u19431.MuseMenuActive{width:514px;min-height:0px;margin:0px -10000px 0px 0px;}#u19433-4{width:506px;min-height:17px;padding-left:2px;padding-top:4px;padding-right:2px;position:relative;margin-right:-10000px;top:10px;left:2px;}#u19309.MuseMenuActive #u19312-4,#u19431:hover #u19433-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u19431.MuseMenuActive #u19433-4{padding-top:4px;padding-bottom:0px;min-height:17px;width:506px;margin:0px -10000px 0px 0px;}#u16963{width:136px;min-height:23px;position:relative;margin-right:-10000px;left:275px;}#u16966{width:136px;padding-bottom:7px;position:relative;}#u16968-4{width:136px;min-height:16px;position:relative;margin-right:-10000px;top:3px;}#u17005{width:136px;min-height:23px;position:relative;margin-right:-10000px;left:413px;}#u17006{width:136px;padding-bottom:7px;position:relative;}#u16927.MuseMenuActive,#u16966.MuseMenuActive,#u17006.MuseMenuActive{width:136px;min-height:0px;margin:0px;}#u17009-4{width:136px;min-height:16px;position:relative;margin-right:-10000px;top:3px;}#u16966.MuseMenuActive #u16968-4,#u17006.MuseMenuActive #u17009-4{padding-top:0px;padding-bottom:0px;min-height:16px;width:136px;margin:0px -10000px 0px 0px;}.js body{visibility:hidden;}.js body.initialized{visibility:visible;}#u13459-bw{z-index:30;min-height:29px;margin-top:107px;}#u13460{z-index:31;width:253px;position:relative;margin-right:-10000px;margin-top:3px;left:800px;}#u13461-7{z-index:32;width:253px;min-height:33px;position:relative;margin-right:-10000px;margin-top:1px;}#u13463-4{z-index:39;width:114px;position:relative;margin-right:-10000px;left:94px;}#u15717{z-index:45;width:93px;height:80px;position:relative;margin-right:-10000px;left:106px;}#u15731{z-index:46;width:579px;height:56px;position:relative;margin-right:-10000px;margin-top:26px;left:174px;}#u15767{z-index:47;width:98px;height:145px;position:relative;margin-right:-10000px;margin-top:60px;left:819px;}#u18199{z-index:127;width:98px;height:145px;position:relative;margin-right:-10000px;margin-top:126px;left:942px;}#u18202{z-index:128;width:98px;height:145px;position:relative;margin-right:-10000px;margin-top:100px;left:882px;}#u18224-4{z-index:129;width:186px;min-height:30px;position:relative;margin-right:-10000px;left:277px;}#u18227-4{z-index:133;width:327px;min-height:30px;position:relative;margin-right:-10000px;left:467px;}#pu19331{z-index:161;width:0.01px;margin-left:107px;margin-top:27px;}#u19331{z-index:161;width:200px;height:54px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);position:relative;margin-right:-10000px;margin-top:195px;left:230px;background:transparent url("../images/k3a.jpg?crc=3842630568") no-repeat center center;background-size:cover;}#u19333{z-index:163;width:942px;border-style:solid;border-width:2px;border-color:#000000;background-color:#F7931E;border-radius:0px 10px 10px 0px ;padding-bottom:3px;position:relative;margin-right:-10000px;margin-top:70px;left:-2px;}#u19335{z-index:168;width:33px;height:19px;border-style:solid;border-width:2px;border-color:#000000;background-color:#F7931E;position:relative;margin-right:-10000px;margin-top:1px;left:913px;}#u19334-4{z-index:164;width:498px;min-height:116px;border-style:solid;border-width:3px;border-color:#FFFF00;background-color:#22B573;border-radius:22px;color:#FFFFFF;font-size:27px;text-align:center;line-height:1.02;letter-spacing:1px;position:relative;margin-right:-10000px;margin-top:49px;left:18px;}#u19336{z-index:169;width:346px;box-shadow:0px 0px 8px rgba(255,255,255,0.5),0px 0px 8px rgba(255,255,255,0.5)/* glow */,
6px 6px 8px rgba(0,0,0,0.5)/* drop shadow*/;border-style:solid;border-color:#F7931E;background-color:#FFFFFF;border-radius:50px;padding-bottom:401px;position:relative;margin-right:-10000px;margin-top:-10px;left:589px;border-width:10px 0px 0px;}#u19336::before{content:"";position:absolute;pointer-events:none;top:-10px;left:0px;bottom:0px;right:0px;border-radius:50px;box-shadow:inset 3px 3px 4px rgba(255,255,255,0.75), inset -3px -3px 4px rgba(0,0,0,0.75);}#u19337-4{z-index:170;position:relative;margin-right:-10000px;width:293px;margin-top:26px;left:27px;}#u19337-4_img{display:block;vertical-align:top;}#u19338-4{z-index:174;width:270px;min-height:68px;border-style:solid;border-width:3px;border-color:#FFFF00;background-color:#22B573;border-radius:22px;font-size:27px;text-align:center;color:#FFFFFF;position:relative;margin-right:-10000px;margin-top:185px;left:18px;}#u19339-7{z-index:178;width:894px;min-height:221px;background-color:transparent;text-align:justify;position:relative;margin-right:-10000px;margin-top:269px;left:21px;}#u19340-4{z-index:185;width:229px;min-height:38px;background-color:transparent;font-size:20px;font-weight:bold;margin-left:128px;margin-top:18px;position:relative;}#pu19341-12{z-index:189;width:0.01px;margin-left:128px;margin-top:-3px;}#u19341-12{z-index:189;width:544px;min-height:125px;background-color:transparent;position:relative;margin-right:-10000px;}#u19343{z-index:205;width:365px;height:495px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);position:relative;margin-right:-10000px;margin-top:108px;left:265px;background:transparent url("../images/lokw2.jpg?crc=3898836686") no-repeat center center;background-size:contain;}#u19344{z-index:206;width:424px;height:184px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);position:relative;margin-right:-10000px;margin-top:517px;left:239px;background:transparent url("../images/pngtree-round-gradient-black-shadow-png-image_4317601.png?crc=70441343") no-repeat center center;background-size:cover;}#pu19332{z-index:162;width:0.01px;margin-left:130px;margin-top:9px;}#u19332{z-index:162;width:200px;height:54px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);position:relative;margin-right:-10000px;margin-top:6px;left:362px;background:transparent url("../images/k3a.jpg?crc=3842630568") no-repeat center center;background-size:cover;}#u19342-4{z-index:201;width:414px;min-height:68px;border-style:solid;border-width:3px;border-color:#FFFF00;background-color:#22B573;border-radius:22px;font-size:27px;text-align:center;color:#FFFFFF;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-3px;left:-3px;}#u19334-2,#u19338-2,#u19342-2{padding-top:15px;}#u19351{z-index:207;width:746px;height:183px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);margin-left:115px;margin-top:14px;position:relative;background:transparent url("../images/kloddd.jpg?crc=304041797") no-repeat center center;background-size:contain;}#u19809-4{z-index:209;width:959px;min-height:46px;border-style:solid;border-width:3px;border-color:#FFFF00;background-color:#F49C00;border-radius:10px;color:#FFFF00;font-size:19px;text-align:center;font-family:Lucida Sans, Lucida Grande, Lucida Sans Unicode, sans-serif;font-weight:bold;margin-left:97px;margin-top:20px;position:relative;}#u19809-2{padding-top:11px;}#u19808{z-index:208;min-height:260px;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);background:transparent url("../images/wave2.png?crc=464547181") no-repeat center bottom;}#u19808_position_content{margin-top:-13px;padding-bottom:30px;width:100%;}#pu19811{z-index:216;width:0.01px;left:165px;position:relative;}#u19811{z-index:216;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:-4px;background:transparent url("../images/d1-u19574-fr.jpg?crc=3827021573") no-repeat center center;background-size:cover;}#u19812{z-index:217;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:114px;background:transparent url("../images/rdj-u19575-fr.jpg?crc=284583400") no-repeat center center;background-size:cover;}#u19813{z-index:218;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:232px;background:transparent url("../images/klopoo-u19576-fr.jpg?crc=4217773226") no-repeat center center;background-size:cover;}#u19814{z-index:219;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:349px;background:transparent url("../images/33561486_1-u19577-fr.jpg?crc=3995642646") no-repeat center center;background-size:cover;}#u19815{z-index:220;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:472px;background:transparent url("../images/1kdj.jpg?crc=4190652069") no-repeat center center;background-size:cover;}#u19816{z-index:221;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-3px;position:relative;margin-right:-10000px;margin-top:-4px;left:590px;background:transparent url("../images/ghyji.jpg?crc=296249144") no-repeat center center;background-size:cover;}#u19817{z-index:222;width:109px;height:173px;box-shadow:6px 6px 8px rgba(0,0,0,0.5);border-style:solid;border-width:4px;border-color:#00FF00;opacity:1;-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";filter:alpha(opacity=100);border-radius:15px;margin-bottom:-4px;position:relative;margin-right:-10000px;margin-top:-3px;left:708px;background:transparent url("../images/lokw.jpg?crc=3891353422") no-repeat center center;background-size:cover;}#u19810-3{z-index:213;width:956px;min-height:48px;border-style:solid;border-width:3px;border-color:#FFFF00;background-color:#F49C00;border-radius:13px;font-size:24px;text-align:center;text-indent:46px;left:98px;margin-top:15px;position:relative;}#u19810{padding-top:9px;}#u19808-bw{z-index:208;min-height:260px;margin-top:24px;}.css_verticalspacer .verticalspacer{height:calc(100vh - 3173px);}#pu11132{z-index:10;width:0.01px;margin:-5px -10000px -650px -100px;}#u11132_align_to_page{margin-left:auto;margin-right:auto;position:relative;width:960px;left:-100px;padding-top:33px;padding-bottom:86px;}#pu11133{z-index:11;width:0.01px;left:104px;position:relative;}#u11133{z-index:11;width:944px;position:relative;margin-right:-10000px;}#u11134-4{z-index:12;width:260px;min-height:47px;position:relative;margin-right:-10000px;margin-top:3px;}#u11137-4{z-index:16;width:214px;min-height:47px;position:relative;margin-right:-10000px;left:730px;}#u11145-4{z-index:25;width:260px;min-height:317px;position:relative;margin-right:-10000px;margin-top:58px;}#u11146{z-index:29;width:138px;height:130px;position:relative;margin-right:-10000px;margin-top:56px;left:766px;}#u20041{z-index:138;width:97px;height:152px;position:relative;margin-right:-10000px;margin-top:2px;left:291px;}#u20042{z-index:139;width:97px;height:152px;position:relative;margin-right:-10000px;margin-top:2px;left:396px;}#u20043{z-index:140;width:97px;height:152px;position:relative;margin-right:-10000px;margin-top:2px;left:501px;}#u20044{z-index:141;width:97px;height:152px;position:relative;margin-right:-10000px;margin-top:2px;left:606px;}#u20075{z-index:142;width:641px;height:14px;position:relative;margin-right:-10000px;margin-top:260px;left:284px;}#u20045{z-index:143;width:100px;height:152px;position:relative;margin-right:-10000px;margin-top:167px;left:333px;}#u20046{z-index:144;width:100px;height:152px;position:relative;margin-right:-10000px;margin-top:167px;left:441px;}#u20047{z-index:145;width:100px;height:152px;position:relative;margin-right:-10000px;margin-top:167px;left:550px;}#pu15491{z-index:43;width:0.01px;left:78px;margin-top:4px;position:relative;}#u15491{z-index:43;width:153px;height:37px;position:relative;margin-right:-10000px;margin-top:19px;left:109px;}#u15492{z-index:44;width:48px;height:37px;position:relative;margin-right:-10000px;margin-top:19px;left:46px;}#u20078{z-index:146;width:641px;height:14px;position:relative;margin-right:-10000px;margin-top:62px;left:307px;}#u20072-4{z-index:147;width:214px;min-height:47px;position:relative;margin-right:-10000px;margin-top:40px;left:396px;}#u20081{z-index:151;width:641px;height:14px;position:relative;margin-right:-10000px;margin-top:116px;}#u20064{z-index:152;width:68px;height:64px;position:relative;margin-right:-10000px;margin-top:94px;left:44px;}#u20065{z-index:153;width:493px;height:61px;position:relative;margin-right:-10000px;margin-top:97px;left:116px;}#u20063-7{z-index:154;width:341px;min-height:156px;margin-bottom:-1px;position:relative;margin-right:-10000px;margin-top:-3px;left:617px;}#u20063-7:hover{padding-top:0px;padding-bottom:0px;min-height:153px;width:338px;margin:-1px -9999px 0px 2px;}#u11132,#u11132-bw{z-index:10;min-height:655px;}#u11140{z-index:20;min-height:43px;padding-bottom:8px;}#u13459_align_to_page,#u19808_align_to_page,#u11140_align_to_page{margin-left:auto;margin-right:auto;position:relative;width:960px;left:-100px;}#u11141-4{z-index:21;width:648px;min-height:27px;position:relative;margin-right:-10000px;margin-top:14px;left:201px;}#u20005{z-index:137;width:209px;height:40px;position:relative;margin-right:-10000px;margin-top:3px;left:729px;}#u11140-bw{z-index:20;min-height:43px;margin-top:595px;}#muse_css_mq,.html{background-color:#FFFFFF;}body{position:relative;min-width:960px;padding-bottom:651px;}.verticalspacer{min-height:1px;}