WBCS.LIVE practice question

What is the unit of 'Power of a Lens' in the International System of Units (SI)?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Meter
  2. Dioptre
  3. Watt
  4. Candela

Correct answer and explanation

Correct answer: Dioptre

Explanation: āœ… Correct Answer: B) Dioptre šŸ“š Explanation: The power of a lens is defined as the reciprocal of its focal length expressed in meters ($P = 1/f$). A lens with a focal length of 1 meter has a power of 1 Dioptre. Convex lenses (converging) have positive power values, while concave lenses (diverging) have negative power values.