First slide

The lens

Question

If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power

Moderate

A

+6.5 D
B

-6.5 D
C

+7.5 D
D

-0.75 D

Solution

$P = \frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} = \frac{1}{(+ 0 .8)} + \frac{1}{(- 0 .5)} = - 0 .75 D$

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