Dioptre is a unit of measurement for __________ ?
Correct answer: B. Lens
- A. Current
- B. Lens
- C. Force
- D. Focal Length
Explanation
A dioptre is the unit of optical power of a lens, equal to the reciprocal of its focal length in metres. Thus a lens with a focal length of 0.5 metre has a power of 2 dioptres.
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