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

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Convex, 50 cm

Convex, 100 cm

Concave, 25 cm

Concave, 20 cm

answer is B.

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Detailed Solution

$P_{eq} = P_{1} + P_{2} = 6 D + (- 4 D) = 2 D Effective focal length = \frac{1}{P_{eff}} = 0.5 = 50 cm .$

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