Question

calculate the power of convex lens of focal length 25cm

Answer 1

Answer:

Given,focal length=25cm=0.4m

formula of power of lens(P)=1/f

=1/0.4m

=4D

where D stands for dioptre which is unit of power of the lens.

Answer 2

The power of the convex lens is +4 D.

Explanation:

We need to find the power of convex lens of focal length 25 cm. The inverse of focal length equals power of a lens. So,

$P=\dfrac{1}{f}\\\\P=\dfrac{100}{25}\ cm\\\\P=+4\ D$

So, the power of the convex lens is +4 D.

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Calculate the power of convex lens of focal length 25 cm

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