Question

Find the focal length of the lens, if the power of the lems is -2d

Answer 1

Explanation:

power = -2D (it is a concave lens )

$p = \frac{1}{f(m)}$

$- 2= \frac{100}{f} cm \\ - 2f = 100cm \\ f = \frac{100}{ - 2} \\ f = - 50cm$

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