Q.

An object is placed at a distance of half the focal length of a convex lens. The image will be


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a

at 2F, virtual and double in size

b

at F, virtual and double in size

c

beyond 2F, real inverted

d

at F, real inverted 

answer is A.

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Detailed Solution

The image will be at 2F, virtual and double in size.
When an object is placed at a distance of half the focal length of a convex lens, the image will be formed on the same side as the object, so the image is virtual and double in size. The following ray diagram shows the formation of an image by a convex lens when the object is placed at half of the focal length.
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