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Image Formation by Lenses

A sharp image...

Question

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the :
(1) lens and the object
(2) lens and the screen
(3) object and the screen
(4) lens and the screen and also between object and the screen

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Solution

A convex lens converges all the rays coming from a distant object on its focus to form a real image. If the image is obtained on a screen placed at the focal point of the lens, then the distance between the lens and the screen would be the focal length of the lens.

Hence, the correct answer is option 2.

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