Question

Power of lens is -4.0d its focal lenght is

Answer 1

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Given:- Power of lens=)-4.0d

then

Focal Length=?

D=1/f

-4.0=1/f

-4.0f=1

f=-1/4.0

f=-0.25

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Additional Answer:-0.25

-0.25×100

25 cm

Thanks!!!

Answer 2

Focal length is the reciprocal of power of length.

So f=1/-4

=-0.25m

=25cm