Explain auxillary method of determining focal length of a convex lens.??
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expose the convex lens to Sun and take a paper and place it at the back of the lens.at one particular point we will get clear sharp point image...measure the distance and that is focal length of coves lens
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expose the convex lens to Sun and take a paper and place it at the back of the lens.at one particular point we will get clear sharp point image...measure the distance and that is focal length of coves lens
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