Question

name the type of lens
if its power is 20D. Find the focal length of this lens​

Answer 1

Answer:

name : convex lens

focal 10 cm

Answer 2

Explanation:

If the power is positive then its F should also be positive.So, it is a convex lens.

$p = \frac{1}{f}$

p=0

=>20=1/f

f=1/20=0.05cm.

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