Chapter 20 review

    Standardized test practice
    1. A ray of light hits a mirror at an angle of 72° to the normal. What is the angle of reflection?
      1. 28°
      2. 72°
      3. 144°
      4. 180°

      2. You and your friend are looking in a mirror
    2. A friend and you are looking in a large, flat mirror against a wall. The friend is 1 m away from the mirror and you are 1 m directly behind her. How far are you from the image of your friend in the mirror?
      1. 0 m
      2. 1 m
      3. 2 m
      4. 3 m

    3. What property of light explains the formation of shadows?
      1. Light travels in straight lines.
      2. Light has different colors.
      3. Light has wave and particle properties.
      4. Light can change direction.

    4. Easy Which of the following are properties of the images formed by a plane mirror?
      1. The image is located behind the mirror.
      2. The image distance is equal to the object distance (although it may be negative).
      3. The image reverses left and right.
      4. The image is smaller than the object.

      1. I and II only
      2. II and III only
      3. I, II, and III only
      4. I, II, III, and IV

    5. Which of the following optical devices uses refraction?
      1. mirror
      2. lens
      3. prism

      1. I only
      2. II only
      3. I and II only
      4. II and III only

    1. What is the best choice in the following list for mounting a laser pointer to a ring stand?
      1. a ring clamp
      2. a 90° rod clamp
      3. wood glue
      4. nylon string

    2. A 20-cm-wide image is seen through a compound system with a magnification of 2.5. What is the width of the subject?
      1. 8 cm
      2. 20 cm
      3. 30 cm
      4. 50 cm

    3. A man is standing 2 m in front of a flat mirror and facing the mirror. How far away from him is his image located?
      1. His image is located at his location, i.e., 0 m away.
      2. His image is located 2 m in front of him.
      3. His image is located 4 m in front of him.
      4. His image is located 2 m behind him.

      4. Which point corresponds to the center of curvature?
    4. The curved mirror depicted has a focal length of 10 cm. Which point on the number line is the center of curvature?
      1. A
      2. B
      3. C
      4. D
      5. E

    5. For which of the following would a ray diagram be useful?
      1. predicting where a shadow will appear for an object held under a light source
      2. representing the electronic circuitry of a lamp
      3. displaying the path of light in a periscope

      1. I only
      2. I and II only
      3. I and III only
      4. II and III only

    6. Which kind of mirror can create an image that is larger than the object?
      1. a flat mirror
      2. a convex mirror
      3. a concave mirror
      4. None of the above is correct.

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