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plane waves refracted for air to water u...

plane waves refracted for air to water using Huygen.s principal `a,b,c,d,e` ae length on the diagram.The refractive index of water wrt air is the ratio.

A

`(a)/( e)`

B

`(b)/(e )`

C

`(b)/(d)`

D

`(d)/(b)`

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The correct Answer is:
D
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