The Radius of Curvature of a Concave mirror is 15 cm. Focal length will be

The radius of curvature of a concave mirror is 15 cm. Its focal length will be

  • -15 cm
  • -7.5 cm
  • +30 cm
  • +7.5 cm
Monis Rasool Professor Asked on 6th May 2015 in Physics.
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Ans.  focal length will be +7.5 cm.
The relation between radius of curvature and focal length —
  f = R/2
 R = =15 cm
f = ?
f = 15/ 2
    f = 7.5 cm.

                             Therefore focal length is +7.5 cm.

Anurag Mishra Professor Answered on 6th May 2015.
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