First slide

The lens

Question

A convex lens of power + 6D is placed in contact with a concave lens of power – 4D. What is the nature and focal length of the combination

Moderate

A

Concave, 25 cm
B

Convex, 50 cm
C

Concave, 20 cm
D

Convex, 100 cm

Solution

$P = P_{1} + P_{2} \Rightarrow P = + 6 - 4 = + 2 D . So focal length f = \frac{100}{2} = + 50 cm; convex lens$

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