Two thin biconvex lens Li and L2 having focal lengths 10 cm and 15 cm

1.	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?
Answer» ANSWER: The minimum DISTANCE between lens L1 and L2 will be SUM of their FOCAL lengths. i.e 10+15 =25 cm.

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?

Answer»

ANSWER:

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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