It is desired to produce a real image on a screen using a convex lens of focal length 10 cm. The minimum distance between the object and the screen should be then
A
20 cm
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B
40 cm
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C
100 cm
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D
The real image is obtained at all distances
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Solution
The correct option is D 40 cm
In a convex lens, minimum distance between the object and its real image is 4f (when the object at 2f).