8. b) Ô d) Consider a yellow piece of construction paper. What color will the paper appear if you shine green light onto it? Explain. What if it is illuminated with magenta light? Explain. Under what light conditions would the paper look black? Explain. The figure below shows a "color wheel" for three light sources illuminating a yellow screen. The top light source is red, the bottom-left is blue, and the bottom-right is green. Complete this figure by indicating the color that will be seen in each of the seven regions on the screen. Explain your reasoning, discussing how you used your answers above and how you determined the color of the regions not described above. Red light Blue light Yellow paper Green light

One well-known image of a prism is the following picture a. Given the pattern of light on the far side of the prism, is the index of refraction inside the prism higher or lower than the index of refraction outside the prism? b. List at least one thing that is wrong with this diagram given what we expect the dependence of n on the wavelength of light to be (and assuming the prism is made of a uniform material). c. List at least one thing that is right with this diagram given what we expect the dependence of n on the wavelength of light to be (and assuming the prism is made of a uniform material).

Physics 20: SUMMER Assignment 13 7. Use the following information and diagram to answer parts a and b. A reflecting surface is inclined 30° above the horizontal. A wave is traveling horizontally and reflects off the surface, as shown below. The solid grey line is the barrier and the black arrow is the wave. (1) (1) a) What is the angle of incidence? 30° 1 b) What is the angle between the incident ray and the reflected ray? 4

Question 1: X-ray Diffraction x-ray diffraction is a method used to identify different types of materials. While this is usually quite a complex process, however for a simple cubic structure, as seen below, we can find the distance between neighboring atoms. The below image shows the diffraction of x-rays passing through a cubic structure and illustrates a change in distance of 2d sine Light rays in phase ● a /I\ 100 20. b d sin 8 2d sin 0 Atoms in crystal If the wavelength of the x-ray is equal to an integer multiple of this change in distance, we will get constructive interference: mλ = 2d sine X-rays of wavelength 0.103 nm reflects off a crystal and a second-order maximum is recorded at a Bragg angle of 25.5°. (a) What is the spacing between the scattering planes in this crystal? (b) At what angle will the third-order maximum occur?

1. A light ray is incident on a glass prism with refractive index 1.5 and apex angleA= 30° as shown below. Draw the path of the light ray until it emerges from the prism. A

Consider a light ray that transitions from a material with a higher index of refraction to a material with a lower index of refraction. a. Does this ray speed up or slow down? b. Does it bend toward the normal line or away from the normal line? (i.e. is 0, > 02 or 8, > 0,?)