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A monochromatic ray is incident on a gla...

A monochromatic ray is incident on a glass slab with glancing angle `30^@` with the surface. If the refractive index of glass with respect to air is `sqrt3`, the angle of refraction in the glass slab is

A

`30^@`

B

`45^@`

C

`60^@`

D

`70^@`

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