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A paralel beam of monochromatic light is...

A paralel beam of monochromatic light is incident on a glass slab at an angle of incidentce `45^@`. Find the ratio of width of beam in glass to that in air ( If refractive index of glass is 1.5).

A

`1/(1.2475)`

B

`1/(1.4134)`

C

`1/(1.732)`

D

`1`

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The correct Answer is:
A
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