Question

Focal length of a convex len is 20 cm. It's power is​

Answer 1

Answer:

Here is the answer:

Explanation:

As power = 1/f (In metres)

and 100/f (In cm)

So power =100/20

=5D

So the power of the convex lens is +5D(dioptre).

HOPE IT HELPS.

Answer 2

Answer:

Power = 1 / f (m)

Explanation:

Focal length = 20 cm = 0.2 m

Power = 1/0.2

Power = +5.0 diopter

Hope this will help you .

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