Question

how will you experimentally determine the focal length of a convex lens by the distant object method?

Answer 1

Answer:

In an open space, against white wall place a metre rule horizontally with it's 0 cm end touching the wall and its other end towards illuminated object which is at a very large distance such as a tree or an electric pole etc.holding the given lens vertically on the metre rule focus the object on the wall by moving the lens to and fro along the length of the metre rule .since the light rays are incident from a distant object are nearly parallel ,the image of it formed on it the wall is almost at the focus of the lens sorry the distance of lens from the wall directly on the metre rule this gives the approximate focal length of the lens.

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