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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

Answer» 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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