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Pole of a mirror

The light ray...

Question

The light rays parallel to the principal axis meet at point M after passing through a convex lens. What is the power of the lens?

A

+5D

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B

+0.5D

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C

+2D

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D

-2D

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Solution

The correct option is A +5D
A convex lens converges the parallel rays coming from an object at infinity, and the image is formed at its principal focus.
f = 20 cm = 0.2m
P = 1/f
P = 1/0.2
P = +5D

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