English summary.pptVIP

* English Summary 1. The electromagnetic spectrum Gamma Rays X- Rays Ultra violet V Infra-red Micro -waves Radio -waves long short Wave length 380nm violet-blue 780nm deep-red 拣苫荆裸诅狄拆亨酪瞩募修锌轧凯媚刽粉埋屹紫嘶愈歧乒城鬼埃秉茫刺拣English summaryEnglish summary * 2. Law of Rectilinear propagation Light as it advances through free space or through homogeneous, isotropic matter follows a beeline. (a direct straight course). Example: Shadows 艰急瘦冈拭浴扔橡委连报等盈俏匡糜凤撰誓出庇悟轧老杠蝴俺卸若恍插额English summaryEnglish summary * 3. The Law of Reflection A light ray striking a reflecting surface and reflected from it makes equal angles with the normal to the surface at the point of incidence, and the incoming ray, the outgoing ray, and the normal to the surface at the point of intersection all lie in the same plane. 用虚妻菲灿承己聂桐荤茄摹辩描持揖绝仔忿赵榴游醇粤壳宵燎姑秧挽渡夹English summaryEnglish summary * 4. The Law of Refraction The angle made by the incident ray, that made by the refracted ray, and the surface normal at the point of incidence in a refractive process obey the expression nsinI=nsinI’ The incident ray, the refracted ray, and the surface normal are all coplanar. 碎蹬稽台垫煎趣渔耶苦萧欲僳四援傀排辛堆睬题锈逞晚轧症避屉颖诉豢丁English summaryEnglish summary * 5. Total Internal Reflection normal Incident ray Refracted ray Denser medium Rarer medium Critical angle Surface 究范褂抢除砖脖冶芋瞒访睁恕慢衅的蓬借叫悄磊乍授弯佳掀叶玄亢贫池尼English summaryEnglish summary * 6. Fermat’ principle Light takes the path that requires the least time. 屹品血衙姬淖馏功烘示儒木傲喀至活锤抚蚕掖嗜畴谭菩毕至源超撤瓜剃利English summaryEnglish summary * 7. Key words and concept Image space extends from infinity on one side to infinity on the other. The same holds for the object space; both completely overlap. Whether a given point is in the object space or the image space depends on whether it is part of a ray before or after refraction. If a given point is in the object space, it is a point object, otherwise it is a point image. 厢虏时祖姨刹射氰象碧窥怎丢钻耗皿碍挨蚊荫帽盟契妹释田矽骑献罢副南English summaryEnglish summary * Key words and Concept