Q.

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


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a

Object height

b

Optical distance

c

Focal length

d

None of the above 

answer is C.

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Detailed Solution

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