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A beam of parallel rays is brought to focus by a plano-convex lens. A thin concave lens of the same focal length is joined to the first lens. The effect of this is

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the focus shifts to infinity

the focal point shifts towards the lens by a small distance

the focal point shifts away from the lens by a small distance

the focus remains undisturbed

answer is A.

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Power of the combination will be zero. The focus shifts to infinity.

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