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Image Formation by Convex Lens

A student has...

Question

A student has to do the experiment on finding the focal length of a given convex lens by using a distant object. She can do her experiment if she is also made available:
(1) a lamp and a screen
(2) a scale and a screen
(3) a lamp and a scale
(4) only a screen

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Solution

A convex lens converges all the rays coming from a distant object and forms a sharp image on the screen placed at the focal point of the lens. To obtain the focal length, the student needs to have a screen to obtain an image of a distant object and a scale to measure the distance of the screen from the lens.

Hence, the correct answer is option 2.

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