Light is travelling from diamond to air. Its speed in diamond is 1.24 X108 m/s. Find the critical angle of diamond-air boundary. (Use nair 1, c = 3x10% m/s) ? a. 45.7° b. 24.4° C. 30.5 °

3. A ray of light crosses from a flint glass slab at 20° from the normal into air. At what angle does it emerge?

38. Which of the following statements, regarding the nature of light, is/are true? Statement A: When light travels from one medium into another medium it must slow down. Statement B: When light slows down as it enters into a new medium it must bend. Statement C: When light travels from one medium to another it can both reflect and refract. Statement D: Refraction of light will occur regardless of the angle of incidence. A. Statements A is true. B. Statements B is true. C. Statements C is true. D. Statements D is true.

12. Material a is water and material b is plexiglass with index of refraction 1.49. The incident light ray makes an angle of 55o with the normal. Obtain the speed of light in material a. A. 2.256 x 108 m/s B. 3.220 x 108 m/s C. 2.088 x 108 m/s D. 3 x 108 m/s

4. A ray of light passes through a prism, making the minimum angle of deviation. The rays enter and emerge at 7° from the normal to the surface. What is the index of refraction of the material, if the prism angle is 50°?

11:19 Optics.pdf -> 2. Find angle ø. (Hint: Use Geometry skills.) 79.4712° Air, n, = 1 3. Find the second angle of 30 incidence. 10.5288° Horiz. ray, parallel to 4. Find the second angle of refraction, 0, using Snell's Law 15.9° base Glass, n = 1.5 Refraction Problem #2 Goal: Find the distance the light ray displaced due to the thick window and how much time it spends in the glass. Some hints given. 20° 0, 1. Find 0. 20° H,0 2. To show incoming & outgoing rays are parallel, find 0. 20° n, = 1.3 3. Find d. 0.504 m glass 10m 4. Find the time the light spends in the glass. n = 1.5 5.2 · 10-8 s Extra practice: Find 0 if bottom medium is replaced with air. H,0 26.4° Refraction Problem #3 Goal: Find the exit angle relative to the horizontal. 0 = 19.8° 36 air glass The triangle is isosceles. Incident ray is horizontal, parallel to the base.

2. A narrow beam of light is incident from air onto the surface of glass with index of refraction 1.56. Find the angle of incidence for which the corresponding angle of refraction is half the angle of incidence. (Suggestion: You might want to use the trigonometric identity sin 2θ = 2sinθcosθ.)

20. A light wave is incident at 0 degrees to the normal approaching a plane mirror. What will be the angle of the reflected ray?A. 0B. 45C. 90D. 180

A light ray enters an unknown substance from air at 71 degree angle. It causes the light ray to be refracted at 23 degree angle. What is index the unknown substance. O 2.42 O 1.00 O 1.33 O1.61