Question

Doctor has prescribed a lens having power +2.5 D. What will be the
focal length of the lens? *​

Answer 1

Answer:

$\underline{\underline{ \sf \huge \red{Answer :-}}}$

we know that power P=2.5D

==>> P = 1 / f

f = 1/2.5 = 0.4m = 40cm

Since the focal length of lens is positive so it is a convex lens. It is a converging lens

Answer 2

Answer:

srr......

Explanation:

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