State the mirror formula for determining the focal length of spherical mirrors. Write the meanings of the symbols used. An object is placed at a distance of 25 cm. from a concave mirror of a focal length of 15 cm. Calculate the distance, position and nature of the image from the mirror. Draw the corresponding ray diagram. 5M
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However, as discussed above, in the small-angle approximation, the focal length of a spherical mirror is one-half the radius of curvature of the mirror, or f=R/2.
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