In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?

A. A ray parallel to the principal axis.
B. A ray passing through the centre of curvature and incident obliquely.
C. A ray passing through the principal focus and incident obliquely.
D. A ray incident obliquely to the principal axis, at the pole of the mirror.

(CBSE SCIENCE SAMPLE PAPER , 2025)

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