Question

Power of a lens is found to be +2.5 Diopter. What kind of lens is it? (1)​

Answer 1

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We know that power P=2.5D

P= $\bold{\frac{1}{f}}$

f = $\bold{\frac{1}{2.5}=0.4m=40cm. }$

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

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Answer 2

We know that power P=2.5D

P= \bold{\frac{1}{f}}

f

1

f = \bold{\frac{1}{2.5}=0.4m=40cm. }

2.5

1

=0.4m=40cm.

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