alleryThe SI unit of the power of a lens is the:
ADiameter
BDialator
CDiverter
DDioptre
Answer & Solution
Correct answer: D. Dioptre
1. It is denoted by the letter D.
2. Focal length must be in metres to use it.
3. The unit is the dioptre.
_Source: syllabus Science, Ch 10 'Light - Reflection and Refraction'_
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