2 thin convex lenses, each of focal length f are placed in contact coa – InterviewSolution

1.	2 thin convex lenses, each of focal length f are placed in contact coaxially. The focal length of combination is F1. When the space between the surface of the lenses are filled with the same material of which the lens are made, the equivalent focal length becomes F2. What is the ratio of F1 and F2?
Answer» 2 thin convex lenses, each of focal length f are placed in contact coaxially. The focal length of combination is F1. When the space between the surface of the lenses are filled with the same material of which the lens are made, the equivalent focal length becomes F2. What is the ratio of F1 and F2?

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