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Image in Thin Lens by Ray Tracing

It is desired...

Question

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).
the minimum distance should be 40

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