First slide

The lens

Question

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a cut lens will be

Moderate

A

2 D
B

3 D
C

4 D
D

5 D

Solution

$P = P_{1} + P_{2}, if P_{1} = P_{2} = P^{'} \Rightarrow P^{'} = P / 2 = 2 D$

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