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A convex lens of focal length 10cm is painted black at the middle portion symmetrically as shown in figure. A point object is placed at a distance of 20cm from the lens. Choose correct option from following.

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The distance between the two images is 6 mm

The distance between the two images is 2 mm

The distance between the two images is 4 mm

Only one image will be formed by the lens

answer is D.

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Detailed Solution

If some part of lens is covered with black paper, the intensity of image will decrease but we get only one image as the optic axis for the both parts is same

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