In the given figure, a wavefront AB movi...

In the given figure, a wavefront AB moving in air is incident on a plane glass surface XY, Its position CD after refraction through a glass slab is showin in gigure. The ratio of width of wavefront AB to the refracted wavefront CD is

`(cos i)/(cos r)`

`(cos r)/(cos i)`

`(sin i)/(sin r)`

`(sin r)/(sin i)`

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