A collimated beam of light... | JEE Main 2026 21 Jan Shift 1

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JEE MAIN 2026

21-01-2026 S1

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A collimated beam of light of diameter 2 mm is propagating along $x$-axis. The beam is required to be expanded in a collimated beam of diameter 14 mm using a system of two convex lenses. If first lens has focal length 40 mm then the focal length of second lens is $\_\_\_\_$ mm.

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