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Chromatic Aberrations

A convex lens...

Question

A convex lens of focal length 80 cm and concave lens of focal length 50 cm are combined together. What will be their resultant power?

A

0.65 D

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B

-0.65 D

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C

0.75 D

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D

-0.75 D

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Solution

The correct option is C -0.75 D
$P_{1} = 1.25 D a n d P_{2} = - 2 D P_{n e t} = P_{1} + P_{2} = - 0.75 D$

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