The SI unit for the power of a lens is the:
ADiameter
BDialyser
CDilation
DDioptre
Answer & Solution
Correct answer: D. Dioptre
1. Power measures how strongly a lens bends light.
2. The SI unit for power of a lens is the dioptre.
3. So the correct answer is dioptre.
_Source: NCERT Class 12 Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_
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