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The x-z plane separates two media A and ...

The x-z plane separates two media A and B with refractive indices `mu_(1)` and `mu_(2)` respectively. A ray of light travels from A to B. Its directions in the two media are given by the unit vectors, `vecr_(A)=ahati+bhatj` & `vecr_(B)=alpha hati+betahatj` respectively where `hati` and `hatj` are unit vectors in the x and y directions. Then

A

`mu_(1)a=mu_(2)alpha`

B

`mu_(1)alpha=mu_(2)a`

C

`mu_(1)b=mu_(2)beta`

D

`mu_(1)beta=mu_(2)b`

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The correct Answer is:
A
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