Q. 14.4( 12 Votes )
A spherical mirror has focal length -10 cm. What type of mirror is it likely to be?
The mirror is likely to be the concave mirror because the focal length of the concave mirror is negative because the focus is on the left-hand side of the mirror which is taken to be negative according to sign convention.
Thus the required spherical mirror is a concave mirror of focal length 10 cm.
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