The power of a lens is 5D. Find its focal length.

Given,
Power of lens (P) = +5D
As we know, the power of the lens is the reciprocal of its focal length.
So, P = 1/f
f = 1/P
= 1/5
= 0.2 m
= 0.2 × 100 cm
= 20 cm
Hence, the focal length is 20 cm.

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