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

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Question

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

Options
  • both concave

  • both convex

  • the mirror is concave and the lens is convex

  • the mirror is convex, but the lens is concave

Solution 1

both concave

By convention, the focal length of a concave mirror and a concave lens are taken as negative. Hence, both the spherical mirror and the thin spherical lens are concave in nature.

Solution 2

 Both concave

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

  Is there an error in this question or solution?
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APPEARS IN

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Solution A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be Concept: Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror.
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