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Q.

A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be: ____________.

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a

both concave

b

the mirror is concave and the lens is convex

c

the mirror is convex and the lens is concave

d

both convex

answer is A.

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Detailed Solution

detailed_solution_thumbnail
  • The focal length is the measurement between the lens and the point of focus.
  • The focal length is always positive for converging lenses and always negative for divergent lenses.
  • Here, both of the answers are concave.
  • Concave lenses and mirrors both have negative focal lengths.
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