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Q: The SI unit of power of a lens is:
  • A. joule
  • B. newton
  • C. diopter
  • D. metre
Correct Answer: Option C - Power of lens is its ability to converge or diverge the rays of light falling on it power of lens is equal to reciprocal of the focal length of the lens. S.I unit of power is diopter (D).
C. Power of lens is its ability to converge or diverge the rays of light falling on it power of lens is equal to reciprocal of the focal length of the lens. S.I unit of power is diopter (D).

Explanations:

Power of lens is its ability to converge or diverge the rays of light falling on it power of lens is equal to reciprocal of the focal length of the lens. S.I unit of power is diopter (D).