Question

A converging lens has a focal length of 250mm. calculate its power and express it according to sign convention?

guyz answer!​

Answer 1

focal length of the lens f =+250mm=250/1000

=+0.25cm

power of the lens P=1/f

P =1/0.25

P=+4D

Answer 2

Answer:

4D

Explanation:

power = 1/focal length = 1/250 = 1/0.25m = 4D

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