Question

A convex lens has focal length +20cm, it's power is..........

(a)+5D (b)-5D (c)+0.05D (d)100D

Answer 1

heya...

Power of the lens is Diopters (D) is the reciprocal of focal length in meters.
So power=1/.2=5D. PLEASE MARK ME AS BRAINLIST AND FOLLOW ME PLEASE

Answer 2

hey mate here is your answer

focal length=20cm=0.2m

power=1/focal length

= 1/0.2

=5Dioptre

hope it will help you

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