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

Updated On: Apr 26, 2024
  • both concave
  • both convex
  • the mirror is concave and the lens is convex
  • the mirror is convex, but the lens is concave.
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The Correct Option is A

Solution and Explanation

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.

So, the correct option is (A): both concave.

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Concepts Used:

Spherical Mirrors

A spherical mirror is a mirror which has been cut out of a spherical surface. 

There are two kinds of spherical mirrors:

  1. Convex Mirror
  2. Concave Mirror
Spherical Mirrors
Spherical Mirrors

 

 

 

 

 

 

 

 

 

Concave Mirror

Concave mirrors are also called converging mirrors, because in these types of mirrors, light rays converge at a point after impact and reflect back from the reflective surface of the mirror.

Convex Mirror

The convex mirror has a reflective surface that is curved outward. Regardless of the distance between the subject and the mirrors, these mirrors are "always" virtual, upright and reduced.