Total Internal Reflection全内反射(英文版).ppt

Q1 Which of the following… Which of the following angles is the critical angle of glass? A B D C Q2 A horizontal light ray is… A horizontal light ray hits a prism as shown. What happens to the light ray? 45? A B C water A small stone Q3 If the breaker is 12 cm tall... If the beaker is 12 cm tall and 8 cm wide, Can we always see the small stone below water from side A? (Given: Refractive index of water = 1.33) Q3 If the breaker is 12 cm tall... Critical angle of water water A small stone 1.33 0.752 48.8? Q3 If the breaker is 12 cm tall... For the light ray from the stone reaching side A, water A small stone 8 12 56.3? Maximum angle of incidence ? on side A Q3 If the breaker is 12 cm tall... Since? is ________ than the critical angle, ______________________ occurs and we _________ always see the stone form side A. water A small stone total internal reflection greater cannot * * * * * * * * * * * * Total internal reflection The picture shows the image of a boy formed by a glass. the glass surface is not smooth enough. only very small amount of light is reflected by the glass. the environment outside is not dark enough. light ray should undergo refraction instead of reflection. dim image ? Introduction The inside surface of water or a glass block can act like a mirror. Total internal reflection Video Simulation 1 Internal reflection A light ray hits the inside face of a semicircular block as follows. What will happen? air glass 1 Internal reflection The incident ray splits into 2 rays. angle of refraction 90o incident ray reflected ray refracted ray air glass For a small angle of incidence 1 Internal reflection incident ray reflected ray air glass C C as angle of incidence ?, angle of refraction ? eventually, angle of refraction = 90? refracted ray angle of incidence = critical angle C 1 Internal reflection no refracted ray reflected ray air glass angle of incidence continues to ?, incident ray 1 Internal reflection Therefore, if angle of incidence C,