Answers and Explanations

Review Questions

1. E
   A plane (flat) mirror will reflect light and produce an image at any distance from the object.
2. C
   A concave mirror is also called a converging mirror.
3. B
   A diverging lens is also called a concave lens, and is thinner in the center than on the edges.
4. C
   The candle is placed at a distance greater than twice the focal length, and so the image formed will be real, inverted, and smaller than the candle.
5. D
   The candle is placed at a distance less than the focal length, and so the image formed will be virtual, upright, and enlarged. This is the case for a magnifying glass.
6. C

   Since Magnification = , then

   d_i = (M)(d_o) = (3)(20 cm) = 60 cm.