1.

When a ray is refracted from one medium to another, the wavelength changes from 6000 Å to 4000 Å. The critical angle for the interface will be

Answer»

`COS^(-1) (2/3)`
`SIN^(-1) (2/sqrt(3))`
`sin^(-1) (2/3)`
`cos^(-1) (2/sqrt(3))`

Answer :C


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