A point source of light is kept at a distance of 15 cm from a converg – InterviewSolution

1.	A point source of light is kept at a distance of 15 cm from a converging lens on its optical axis. A sharp image is formed on the screen which is placed at distance 20 cm from lens. Find the focal length of the lens.
Answer» A point source of light is kept at a distance of 15 cm from a converging lens on its optical axis. A sharp image is formed on the screen which is placed at distance 20 cm from lens. Find the focal length of the lens.

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