A small object is placed on the focus on the left side of a convex lens. Where will be the image formed?

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Step-by-step explanation:

1. For a thin convex lens the lens formula is $\displaystyle \frac{1}{f}=\frac{1}{v}+\frac{1}{u}$.
2. If the object is placed at the focal point on the left, the object distance is $u=f$. Substituting gives

$\displaystyle \frac{1}{f}=\frac{1}{v}+\frac{1}{f}\ \Rightarrow\ \frac{1}{v}=0$.

3. Hence $v=\infty$, which means the refracted rays are parallel and the image is formed at infinity on the right side of the lens.

Therefore the correct option is (3): At infinity on the right side of the lens.

FINAL_ANSWER: c

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