First slide

The lens

Question

A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be

Moderate

A

-16 D
B

+16 D
C

-6 D
D

+6 D

Solution

$P = \frac{100}{f_{1}} + \frac{100}{f_{2}} = \frac{100}{(+ 25)} + \frac{100}{(- 10)} = - 6 D$

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