4. The diagram below shows a light ray moving from material A to material B. Use Snell's Law and the information below to calculate the angle of refraction, ẞ, of the light ray as it passes from A to B. Show how you reach your answer. The angle a is 35° The refractive index of A: = 1.52 The refractive index of B: = 1.31 >> a N B β 5. The diagram below shows 3 light rays moving between two materials. Identify the angle (x, y or z) which shows the following and provide a brief explanation for your choice. i) Total internal reflection ii) The critical angle X Material A Material B

4. The diagram below shows a light ray moving from material A to material B. Use Snell's Law and the information below to calculate the angle of refraction, ẞ, of the light ray as it passes from A to B. Show how you reach your answer. The angle a is 35° The refractive index of A: = 1.52 The refractive index of B: = 1.31 >> a N B β 5. The diagram below shows 3 light rays moving between two materials. Identify the angle (x, y or z) which shows the following and provide a brief explanation for your choice. i) Total internal reflection ii) The critical angle X Material A Material B