Question

the power of convex lens of focal length 25 cm is___​

Answer 1

Answer:

Power is expressed as the inverse of focal length, where a focal length of 1 meter is equal to one diopter. So a 25 cm. focal length (0.25 meters) has a power of 4 diopters.

Explanation:

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Answer 2

P= 100/f ( for cm)

P=100/25

P=4 D