Question

What happens when a ray of light, travelling from one optical medium to another optical medium, strikes the surface of separation of the two media?
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Answer 1

Answer:

When a ray of light, while travelling from one optical medium to another optical medium(say, from air to glass) strikes the surface of separation of two media, is returned by the second optical medium into the first optical medium with a change of angle, the phenomenon is called the reflection of light

Explanation:

Answer 2

Answer:

when a ray o light travells from one optical medium to another and strikes the surface of seperation, the angle of such an incident ray of light deflects and enters the second medium. Angle of deflection depends on the nature of the two media. This phenomenon is called refraction of light.