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Q: If the focal length of a spherical mirror increases to double, then the radius of curvature of the mirror will:
  • A. increase to double
  • B. remain the same
  • C. increase to four times
  • D. decrease to half
Correct Answer: Option A - Relation between focal length (f) and radius of curvature R) is - R = 2f ........(i) From equation (i) it is clear that if the focal length of a spherical mirror increases to double then the radius of curvature of the mirror will increase to double.
A. Relation between focal length (f) and radius of curvature R) is - R = 2f ........(i) From equation (i) it is clear that if the focal length of a spherical mirror increases to double then the radius of curvature of the mirror will increase to double.

Explanations:

Relation between focal length (f) and radius of curvature R) is - R = 2f ........(i) From equation (i) it is clear that if the focal length of a spherical mirror increases to double then the radius of curvature of the mirror will increase to double.