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प्रश्न
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
(a) 0°
(b) 45°
(c) 90°
(d) 120°
उत्तर
90°
If a ray of light travels along the normal, it is not refracted.
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