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प्रश्न
If you are to determine to focal length of a convex lens, you should have
(A) a convex lens and a screen
(B) a convex lens and a lens holder
(C) a lens holder, a screen holder and a scale
(D) a convex lens, a screen, holder for them and a scale
उत्तर
A convex lens, a screen, holders for them and a scale are required in order to determine the focal length of a convex lens.
The Correct Answer is D
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