A light ray passing through centre of curvature retraces its path justify

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A ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path because when ray of light passes through centre of curvature of a concave mirror it strikes the mirror at 90 degree that is incident ray coincides normal therefore angle of incidence = 0 so, according to law of reflection angle of reflection = 0 thus ray of light retraces its path.

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two balls of the same mass are shot operate one after another at an interval of 2 seconds along the same vertical line with the same initial velocity of 39.2 metre per second they will collide at the height
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