By using a concave mirror, image of a tree is focused on a screen. Prove that the distance between the screen and the mirror is equal to twice the focal length of the concave mirror.

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I think the question is wrong.

An object at infinity (in this case the tree) when focused through a concave mirror forms an image at the focus so the distance between the screen and the mirror is equal to the focal length of the mirror, and not twice the focal length.

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By using a concave mirror, image of a tree is focused on a screen. Prove that the distance between the screen and the mirror is equal to twice the focal length of the concave mirror.

I think the question is wrong. An object at infinity (in this case the tree) when focused through a concave mirror forms an image at the focus so the distance between the screen and the mirror is equal to the focal length of the mirror, and not twice the focal length.

I think the question is wrong.

An object at infinity (in this case the tree) when focused through a concave mirror forms an image at the focus so the distance between the screen and the mirror is equal to the focal length of the mirror, and not twice the focal length.