Question

the focal length of a lens is 50 cm.its power would be​

Answer 1

Answer: Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D.

Answer 2

Answer:

2 Diopter

Explanation:

$p = 1 \div f$

so

1÷50×10^-2

that is 2 D

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