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Q: If the focal length of a mirror is +15, it is:
  • A. plane mirror
  • B. concave mirror
  • C. convex mirror
  • D. double lens
Correct Answer: Option C - It the value of focal length (distance) of a mirror is positive then it will be convex mirror but if the value of focal length is negative then it will concave mirror.
C. It the value of focal length (distance) of a mirror is positive then it will be convex mirror but if the value of focal length is negative then it will concave mirror.

Explanations:

It the value of focal length (distance) of a mirror is positive then it will be convex mirror but if the value of focal length is negative then it will concave mirror.