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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 lens if the image is equal to the size of the object? Also find the power of the lens.

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 lens if the image is equal to the size of the object? Also find the power of the lens.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
3 years ago
v = + 50 cm Since image is real and of same size. The position of image should be double the focal length. Hence, the object should be at 2f. V = 2f = 50, f = 25 cm. Power = 1/f = 100/25 = 4D

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