1.

A wavefront AB moving in air is incident on a plane glass surface XY as given in figure.Its position CD after refraction through the glass slab is shown along with normals A to D. The refractive index of glass w.r.t.air is given by :

Answer»

`(BD)/(AC)`
`(sin theta)/(sin phi)`
`(sin phi)/(sin theta)`
`(AB)/(CD)`

Solution :`MU = (sin i)/(sin R)` , here i = `theta` and r = `phi`
`therefore mu= (sin theta)/(sin phi)`


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