a convex lens produce real and inverted image of a needle at 50 cm far from lens. For obtain same image like object, than how far is a needle kept from convex lens ? calculate power of lens.
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Answer:
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The position of the image should be at 2F since the image is the real and same size.
It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Therefore, the needle is placed in front of the lens at a distance of 50 cm.