Question

the focal length of convex lens is 25 cm .what is its power?​

Answer 1

Answer Expert Verified

Answer Expert Verified P = + 4 D. Since it is a positive focal length, the lens will be a convex lens or a converging lens and the power is written as '+'.

Answer 2

P= 1/f

f=25cm=0.25m

P= 0.25/1 =4D

Since, it is a convex lens, the power is positive.

Thus,

P= +4D,,

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