First slide

The lens

Question

A lens of focal power 0.5 D is

Moderate

A

A convex lens of focal length 0.5 m
B

A concave lens of focal length 0.5 m
C

A convex lens of focal length 2 m
D

A concave lens of focal length 2 m

Solution

$P = \frac{1}{f} \Rightarrow f = \frac{1}{0 .5} = 2 m$

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