Concave mirror image An object is located at the focal point of a concave mirror

Question

Concave mirror image

An object is located at the focal point of a concave mirror. Which one of the following is true?

1.The image is real, inverted, and located at twice the focal distance on the same side of the mirror as the object.
2.The image is real, erect, and located at half the focal distance on the same side of the mirror as the object.
3.The image is virtual, erect, and located at twice the focal distance on the same side of the mirror as the object.
4.The image is real, inverted, and located at half the focal distance on the same side of the mirror as the object.
5. There is no image

I tried 2 and 3 and it was wrong - I have 1 try left , please someong help

Explanation / Answer

here ,

when the object is kept at the focal point of the mirror ,

as do = f

then , using mirror equation

1/f = 1/do + 1/di

1/di = 0

Which gives di (image distance) as inifinte ,

which means there is no image

option 5)

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