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For passage of monochromatic beam of lig...

For passage of monochromatic beam of light in a medium of refractive index 1.5, the plane wavefront makes an andlge of `60^@` with the refracting surface. The width of beam in medium to that in air is

A

`1:2`

B

`1:1`

C

`1:5`

D

`2:0`

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The correct Answer is:
B
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