Question

When an object is placed at the principal focus of a concave mirror, the image will be formed at the
(a) Focus
(b) Centre of curvature
(c) Pole
(d) Infinity​

Answer 1

Answer:

d. infinity

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Answer 2

Answer:

d)

$infinity$

it is just opposite to the fact that when an object is at infinity its image is formed at the focus of the concave mirror