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Q.
A ray passing through or directed towards centre of curvature of a spherical mirror is reflected such that it trace back of its path, because
Ray Optics and Optical Instruments
Solution:
As we know, angle $i=0^{\circ}$ and angle $r=0^{\circ}$, when light ray is passes through centre of curvature of a spherical mirror is reflected such that it trace back its path.