Question : Dioptre is the unit of:
Option 1: power of a lens
Option 2: focal length of a lens
Option 3: light intensity
Option 4: sound intensity
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Correct Answer: power of a lens
Solution : The correct answer is the power of a lens.
The focal length determines the lens's power. The power of a lens will decrease with increasing focal length and increase with decreasing focal length. Light has less power if there is less bending of it. If the focal length is specified in meters, the lens's power is calculated in diopters (D). One dioptre is equivalent to the focal length times its reciprocal.
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