1.

A ray of light continues to move along the same path while passing through an air-glass interface. The angle of incidence for the light ray is

Answer»

`90^(@)`
`45^(@)`
`0^(@)`
`120^(@)`

Solution :The LIGHT ray CONTINUES to move along the same path while passing through an air-glass interface. It is possible only if angle of incidence `angle i` and HENCE angle of refraction `angle r` is zero. In other words the light ray should strike the interface normally.


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