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Question

An object is placed at a distance of f2 from a convex lens. The image will be formed:


A

At f, virtual and double its size.

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B

At f, real and inverted.

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C

At 2f, virtual and erect.

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D
At 2f, real and erect.
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Solution

The correct option is A

At f, virtual and double its size.


Given u=f2
1f=1v1u
1f=1v+(1f2)1v=1f2f
1v=1f
So v=f i.e., the image will be formed at focus of the lens on the same side as that of the object.
Now magnification m=vu=ff2=+2
So the image formed will be virtual with magnification +2.


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