CHAPTER 19 Assessment

Reviewing Content

Choose the letter that best answers the question or completes the statement.

1. A reflected ray of light is one that

   1. bends as it enters a new medium.

   2. bounces off a surface.

   3. always forms an image.

   4. travels faster after it is reflected.

2. Which law states that the angle of incidence equals the angle of reflection?

   1. law of refraction

   2. law of diffraction

   3. law of reflectiond.

   4. law of images

3. A plane mirror is

   1. curved outward.

   2. flat.

   3. curved inward.

   4. always round.

4. A virtual image

   1. can never be seen.

   2. cannot be projected.

   3. is always enlarged.

   4. is formed in front of a plane mirror.

5. Concave lenses cause rays to

   1. come together.

   2. spread apart.

   3. reflect.

   4. form real images.

6. Which forms where light rays converge?

   1. imaginary image

   2. real image

   3. virtual image

   4. blind image

7. A ray is incident on a material at the material's critical angle. At what angle does the ray refract?

   1. 0 degrees

   2. 45 degrees

   3. 90 degrees

   4. 180 degrees

8. Which optical device uses mirrors and lenses to magnify images of distant objects?

   1. reflecting telescope

   2. pinhole camera

   3. microscope

   4. refracting telescope

9. The two areas in the eye in which light rays are refracted are

   1. the cornea and the lens.

   2. the pupil and the lens.

   3. the retina and the lens.

   4. the rods and the cones.

10. Which corrects nearsightedness?

    1. concave lens

    2. converging lens

    3. diverging mirror

    4. astigmatism

Understanding Concepts

11. According to the law of reflection, the angle of incidence is equal to what other angle?

12. Describe the image formed by a plane mirror.

13. Why can convex mirrors produce only virtual images?

14. Under what conditions does light bend when it enters a new medium?

15. How is the index of refraction of a medium related to the speed of light in the medium?

16. Explain why a concave lens cannot form a real image.

17. What occurs when the critical angle is exceeded?

18. A student-drawn ray diagram for a lens is shown below. Identify the errors the student made in the diagram.

    

19. Which part of the camera shown in Figure 14 controls the amount of light that strikes the film?

20. Explain how the human eye changes focus from near objects to faraway objects.

21. Explain why rods are more effective than cones for seeing objects at night.

22. Explain how diverging and converging lenses are effective for treating nearsightedness and farsightedness.

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