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Q: If the power of a corrective lens is + 2.0D, then it is a -
  • A. convex lens
  • B. concave lens
  • C. convex mirror
  • D. concave mirror
Correct Answer: Option A - The ability or power of a lens is the inverse of its focal length. If the focal length of the lens is f m, the lens has a power P = 1/f diopter. The power of a convex lens is positive and the power of a concave lens is negative. Given the power of the lens is (+2) diopter i.e. positive. Corrective lens is convex lens.
A. The ability or power of a lens is the inverse of its focal length. If the focal length of the lens is f m, the lens has a power P = 1/f diopter. The power of a convex lens is positive and the power of a concave lens is negative. Given the power of the lens is (+2) diopter i.e. positive. Corrective lens is convex lens.

Explanations:

The ability or power of a lens is the inverse of its focal length. If the focal length of the lens is f m, the lens has a power P = 1/f diopter. The power of a convex lens is positive and the power of a concave lens is negative. Given the power of the lens is (+2) diopter i.e. positive. Corrective lens is convex lens.