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Amol performed an experiment on tracing ...

Amol performed an experiment on tracing the path of a ray of light passing through a rectangular glass slab. When ray of light enters from air to glass slab, he observed `angle I =45^(@)`. The angle of refraction must be

A

`45^(@)`

B

more than `45^(@)`

C

less than `45^(@)`

D

`60^(@)`

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