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Q: If the size of a spherical mirror increases in such a way that its radius of curvature gets doubled, then its focal length will –––––––.
  • A. increase to double
  • B. remain same
  • C. decrease by its half
  • D. become infinite
Correct Answer: Option A - If the size of a spherical mirror increases as that its radius of curvature gets doubled, then its focal length will also become double. as we know that Radius of curvature = 2 × focal length.
A. If the size of a spherical mirror increases as that its radius of curvature gets doubled, then its focal length will also become double. as we know that Radius of curvature = 2 × focal length.

Explanations:

If the size of a spherical mirror increases as that its radius of curvature gets doubled, then its focal length will also become double. as we know that Radius of curvature = 2 × focal length.