First slide

The lens

Question

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

Moderate

A

10 cm
B

12.5 cm
C

16.6 cm
D

8.33 cm

Solution

Power of the combination $P = P_{1} + P_{2} = 12 - 2 = 10$
$∴ Focal length of the combination F = \frac{100}{P} = \frac{100}{10} = 10 cm$

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