Question

when the object is at infinity​

Answer 1

Object at infinity:

Since parallel rays coming from the object converge at principal focus, F of a concave mirror; after reflection. Hence, when the object is at infinity the image will form at F.

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Answer 2

Answer:

actually what the question

but for concave mirror when object is at infanite then image at at focus

also object at focus image at infanite

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