Question
An object is placed at a distance of f2 from a convex lens. The image will be formed:
Answer: Option A
:
A
Given u=−f2
1f=1v−1u
⇒1f=1v+(1f2)⇒1v=1f−2f
⇒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 magnificationm=vu=−f−f2=+2
So the image formed will be virtual with magnification +2.
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:
A
Given u=−f2
1f=1v−1u
⇒1f=1v+(1f2)⇒1v=1f−2f
⇒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 magnificationm=vu=−f−f2=+2
So the image formed will be virtual with magnification +2.
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