Spherical Mirrors: Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate?
A. It would be best to use a plane mirror.
B. It would be best to use a convex mirror.
C. It would be best to use a concave mirror, with the object to be ignited positioned at the center of curvature of the mirror.
D. It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature.
E. One cannot start a fire using a mirror, since mirrors form only virtual images.
Answer: D
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