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A convex lens forms a real and inverted ...

A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convec lens if the image is equal to the size of the object ? Also, find power of the lens.

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Since the image is real and same size. The position of image should be at 2F
It is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Hence, the needle is placed in front of the lens at a distance of 50 cm. Object distance, u = - 50 cm Image distance, v = 50 cm
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