AP Physics B Review Ch 23: Optics 1. How does do compare to di for a plane mirror? 2. What type of image is formed in a plane mirror? 3. If a light ray is incident on a plane mirror at 24°, what is the reflected ray? _____ What is the angle between the incident ray and the reflected ray? ____ 4. A concave mirror with radius of curvature 40 cm creates a real image 60 cm from the mirror. What is the object distance? 5. A concave mirror has a radius of curvature of 40 cm. What distance is the focal length from the mirror? 6. Draw a ray diagram for a concave mirror with do > 2f using 3 rays in the space below: 7. What does negative mean for di? 8. What does negative mean for m? 9. A convex mirror has a focal length -15 cm. An object is placed 10 cm in front of the mirror on the principal axis. Where is the image located? 10. What is the speed of light through a material with an index of refraction, n = 1.33? 11. If light enters a substance from air at an angle of 38°, and continues and an angle of 25°, what is the index of refraction of the material? 12. What is the critical angle, θc for any material? (definition and equation) 13. What is the critical angle for light traveling from glass (n = 1.52) into air (n = 1.003)? 14. The critical angle for an optic fiber is 23°. What happens to all light rays with an angle of incidence larger than this? 15. What happens to all light rays with an angle of incidence smaller than 23°? 16. An object is placed 20 cm from a converging lens, f = 8 cm. Where is the image located? 17. Draw the above situation in the space below: 18. List 2 characteristics that help distinguish between a real image and a virtual image. .