First slide

The lens

Question

Two lenses of power + 12 and – 2 diopters are placed in contact. The combined focal length of the combination will be

Moderate

A

8.33 cm
B

1.66 cm
C

12.5 cm
D

10 cm

Solution

$P = P_{1} + P_{2} = + 12 - 2 = 10 D NowF = \frac{1}{P} = \frac{1}{10} m = 10 cm$

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