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The refreactive index of space changes w...

The refreactive index of space changes with y, who function is given as
`mu(y) = {{:(1 " "if," "y le 0),(ky^(2) if,0 le y le 2y_(0)),(l " " if,2y_(0) le y le 4y_(0)),(y^(2),):}`

where k and l are positive constants. A light ray is incident at point A as shown in figure. When the ray reaches to point B, it becomes parallel to xz-plane. Choose the correct statement.

A

B

C

D

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The correct Answer is:
A
`E=(-dv)/(dx)`
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