Question

5. The focal length of a convex lens is 25 cm, then what is its power ?
A. + 2.5 D
B. + 5.0 D C. + 4.0 D D. + 10.0D
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Answer 1

Answer:

C.+4.0 D

Explanation:

Power = 100/f

=100/25

=+4D

If the focal length is in meters then the formula will be 1/f

And it is a convex lens so the focal length is positive

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Answer 2

Answer:

c) +4.0D

Explanation:

P=1/f

(1m =100 cm)

therefore 100/25

P=+4D

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