A ray of light passes from a medium A to another medium B. No bending of light occurs if the ray of light hits the boundary of medium B at an angle of __?

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0^{\circ}

45^{\circ}

90^{\circ}

120^{\circ}

answer is C.

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Detailed Solution

A ray of light passes from medium A to another medium B. No bending of light occurs if the ray of light hits the boundary of medium B at an angle of

90^{\circ}

.
For no refraction of light, the incident ray must hit perpendicular to the surface.
The ray of light will make an angle of

90^{\circ}

when it passes from medium X to medium Y, hitting the boundary, Hence it is perpendicular.

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