The magnification of an image formed by a concave mirror is -1.If the distance of the image from the pole is 25 cm.where is the object placed?find the focal length of the mirror .draw the ray diagram.
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Explanation:
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For a concave mirror, the image distance becomes equal to the object distance, i.e., the image is formed at the object position when the object is placed on the centre of curvature for the concave mirror.
So, object distance= radius of curvature.
We know that, for a spherical mirror, radius of curvature=2× focal length.
Given, focal length=25cm
Therefore, object distance= radius of curvature=2×25cm=50cm
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