By using a concave mirror, image of a tree is focused on a screen. The distance between the screen and the mirror is ………
A
Equal to the radius of curvature of the mirror
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B
Equal to half the radius of curvature of the spherical mirror
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C
Equal to twice the focal length of mirror
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D
Equal to one-fourth the focal length of the mirror
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Solution
The correct option is B
Equal to half the radius of curvature of the spherical mirror
Ray diagram for this question is
The only case of the concave mirror when the object is at infinity and an image is formed on the screen is when the screen is at focus because after reflection the rays converge at the focus.
It is understood from the ray diagram that the rays are coming from infinity and the image is being formed at focus i.e. half the radius of curvature.
By using a concave mirror, the image of a tree is focused on a screen. The distance between the screen and the mirror is equal to half the radius of curvature of the spherical mirror.
