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A magnified image of real object is to be obtained on a large screen 1 m from it. This can be achieved by

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Using a convex lens of focal length less than 0.25 m

Using a concave mirror of focallength less than 0.25 m

Using a concave lens of focal length less than 0.25 m

Using a convex mirror of focal length less than 0.25 m

answer is B, C.

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Detailed Solution

As the image is formed on screen, it is real image.

If $f = 1 / 4 m$ , image distance (1m) is greater than 2f.

This is possible by concave mirror and convex lens if the real object lies in between the distances f and 2f from mirror or lens.

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