If an object is placed at the focus of a convex lens, its image is

by

If an object is placed at the focus of a convex lens, its image is

at the focus on the same side.
at the focus on the opposite side.
coincident with the lens.
at infinity.
This question was previously asked in
UPSC CDS-2 – 2022
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When an object is placed at the principal focus of a convex lens, the rays of light from the object become parallel after refraction through the lens. Parallel rays are considered to meet at infinity. Therefore, the image is formed at infinity.
A convex lens converges parallel rays of light to its principal focus and makes rays originating from its principal focus parallel. This is one of the standard ray diagrams for convex lenses.
The image formed at infinity is typically considered real, inverted, and highly magnified. This principle is used in devices like telescopes (for distant objects) and in projectors to obtain a magnified image at a large distance.

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