Two thin biconvex lens Li and L2 having focal lengths 10 cm and 15 cm respectively are placed coaxially. What distance ld cm) should be maintained between them so that a parallel beam of light, parallel to their axis, incident on 4 emerges from L2 underiated? If the distance between them is increased to twice (2 dcm), then at what distance from LI on the axis, does the convergent beam converge?
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The minimum distance between lens L1 and L2 will be sum of their focal lengths. i.e 10+15 =25 cm.
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The minimum distance between lens L1 and L2 will be sum of their focal lengths. i.e 10+15 =25 cm.
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