Question

If the power of lens is +5 D, then its focal length will be

Answer 1

Answer:

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Answer 2

Answer:

f=20 cms.

Explanation:

Power of a lens is determined by the formula

P=1/f (when focal length is in meters)

and P=100/f (when focal length is in centimeters)

Here,the power is given as 5 diopters.

On equating we get,

5=100/f

f=100/5

f=20 cms.