Find the power of a concave lens whose focal length is 50 cm
assthha161:
P =100/50 =2 dioptre
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4
Power of a lens is always reciprocal to the focal length. So, a convex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D. Since, a convex lens is a converging lens, the power of the convex lens is +2D
Convex (So Focal length is positive)
Given : f = +50 cm or +50 x 10^-2 m
To Find : P = ?
Formula : P = 1/f
P = 1/50 x 10^-2
P = 100/50
P = 2
Therefore P = 2 dioptre or 2 D
Answered by
2
power = 1 ÷ focal length
in metres p = 1 ÷ f
in cm p = 100÷ f
f = 50 cm
p = 100 ÷ 50
p = 2D
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