Question

an object is placed at the focus of a concave mirror where is the image fomed

Answer 1

Hi,
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Here is your answer,
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If object is placed as soon then the image formation takes place beyond centre of curvature of that mirror .
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HOPE YOU WILL UNDERSTAND MY WORDS, a request is here please as I am an ACE ranker I wish that to make my way easy for the GENIUS rank you should mark my answer brainlest if you wish then only ☺.
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Answer 2

Object between Principal Focus (F) and Pole (P): When the object is placed between principal focus and pole of a concave mirror, an enlarged, virtual and erect image is formed behind the mirror. Properties of image: Enlarged