an object is held at the principal focus of a concave lens of focal length f. where the image will form

The image of an object kept at principle focus of a concave lens then the image will be formed between the optical centre and the principle focus on the same side of the lens in which the object is kept.

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THE IMAGE WILL BE FORMED AT INFINITY.

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behind the mirror

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WHEN IT IS SAID THATOBJECT IS KEPT AT FOCUS,THEN WHATEVER THE FOCAL LENGTH BE,IT IS FOR SURE THAT THE IMAGE WILL BE FORMED AT INFINITY.WHEN YOU WILL SEE A RAY DIAGRAM YOU WILL NOTICE THAT THE RAYS ARE GOING PARALLEL.AS PARALLEL LINES DO NOT INTERSECT THE IMAGE IS FORMED AT INFINITY

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