Question

Why does the ray of light passing through the optical centre bounce back into the same path?

Answer 1

Explanation:

Because when ray of light passing through the centre of curvature ( optical centre ) of mirror then light stick along normal to the mirror or surface so it reflect back.

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Answer 2

Explanation:

A ray of light passing through the centre of curvature of a concave mirror retraces its path (gets reflected along the same path), because as the ray of light passes through centre of curvature of a concave mirror it strikes the mirror along the normal i.e. it incidences on to the mirror at 90 degree.