A lens of power 8 D is kept in contact with another lens of power -4 D. The lens combination will act as a:

Question

A lens of power 8 D is kept in contact with another lens of power -4 D. The lens combination will act as a: — Exam MCQ

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B. Convex lens with focal length 25 cm — For lenses in contact, powers add: P = 8 + (-4) = +4 D. Hence f = 1/P = 0.25 m = 25 cm. Positive power means the combination acts as a convex lens.

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A. Concave lens with focal length 25 cm

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C. Convex lens with focal length 50 cm

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D. Concave lens with focal length 50 cm

A lens of power 8 D is kept in contact with another lens of power -4 D. The lens combination will act as a:

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