What is the power of a concave lens of focal length 50 cm?

+ 2D

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- 2D

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+ 5D

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- 0.5D

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Solution

The correct option is D - 2D
Answer is B.
The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses.
Hence, the power of a concave lens of focal length 50 cm is -2D.

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The power of a lens is, - 2 D. What is its focal length ?

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