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A light beam travelling along the x axis...

A light beam travelling along the x axis with planar wavefront is incident on a medium of thickness t. In the region, where light is falling the refractive index can be taken to be varying such that `(dn)/(dy)gt0`. The light beam on the other side of the medium will emerge

A

parallel to the x-axis

B

bending downward

C

bending upward

D

split into two or more beams

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The correct Answer is:
C
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