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Q.

An object is placed at a distance of f/2 from a convex lens of focal length f. The image will be

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a

at 3f/2 real and inverted

b

at one of the foci, virtual and double its size

c

none of these

d

at 2f, m virtual and erect

answer is A.

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Detailed Solution

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1v-1-f/2=1f 1v=1f-2f=-1f Again,  vu=-ff/2=2

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An object is placed at a distance of f/2 from a convex lens of focal length f. The image will be