Is this true that image is formed at focus when object is placed at infinity?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
When the object is placed at infinity, the two parallel to the principal axis rays

AB

and

DE

are reflected at points

B

and

E,

respectively, and intersect at the principal focus

F

on the principal axis. As a result, the image is formed at the primary focus, which is highly diminished, real, and inverted in this case. Because the rays cannot bend coming from a long distance without colliding with any obstacles, they will be straight and parallel. This is why we say the rays are almost parallel.
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