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A concave mirror forms sharp image of a distant tree. What is the separation between the mirror and the screen called?

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When an object is kept at infinity or larger distances than the image is formed at the focus. Therefore the image of the distant tree will be formed at the focus of the concave mirror. So the screen will be placed at the focus to obtain the image And the distance between the mirror and the screen will be the focal length. 

Figure below shows the ray diagram for the same.

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