How do you find the focal length of a lens experimentally? – InterviewSolution

1.	How do you find the focal length of a lens experimentally?
Answer» Take the lens (Ex : Convex), which focused towards the distant object. A white coated screen (Ex : White paper) is placed on the other side of the lens. Adjust the screen till you get a clear image of the object. At this position measure the distance between the lens and screen which is equal to the focal length of the lens.

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