State the condition under which no refraction occurs even when light travels from one medium to another.

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Solution

Conditions for NO refraction:
When the incident ray makes an angle of 0° with the normal.
In this case, the light ray goes in the second medium undeviated along the normal.
This is also known as normal incidence.

Hence, the condition under which no refraction occurs even when light travels from one medium to another is normal incidence.

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