A beam of parallel rays is brought to a focus by a plano-convex lens. – McqOptions

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1.	A beam of parallel rays is brought to a 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 [KCET 2004]
A.	The focal point shifts away from the lens by a small distance
B.	The focus remains undisturbed
C.	The focus shifts to infinity
D.	The focal point shifts towards the lens by a small distance
Answer» D. The focal point shifts towards the lens by a small distance

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