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CBSE Class 10 Science Question 4 of 31

Light - Reflection and Refraction — Question 4

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Question 4

A spherical mirror and a thin spherical lens have a focal length of -15 cm. The mirror and the lens are likely to be

  1. both concave
  2. both convex
  3. the mirror is concave, and the lens is convex
  4. the mirror is convex, but the lens is concave
Answer

both concave

Reason — According to the sign convention, the focal length for both a concave mirror and a concave lens is negative.