The power of a convex lens of focal length 20 cm is

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A convex lens is of focal length 20 cm. Find its power.

Given: Focal length f = 20cm = 0.2 m

Power = `1/"Focal length in m"=1/0.2` = 5D

Is there an error in this question or solution?

Page 2

If the lens is of focal length 25 cm. Calculate the power of the lens.

Focal length = 25 cm = 0.25 m

P = `1/0.25` = 4D

Is there an error in this question or solution?

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