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A student has to do the experiment on fi...

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 :

A

a lamp and a screen

B

a scale and a screen

C

a lamp and a scale

D

only a screen

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B
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LAKHMIR SINGH & MANJIT KAUR-THE HUMAN EYE AND THE COLOURFUL WORLD -Multiple Choice Questions
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