In the adjoining diagram, a wavefront AB , moving in air is incident on a plane glass surface XY . Its position CD after refraction through a glass slab is shown also along with the normals drawn at A and D . The refractive index of glass with respect to air ( 
) will be equal to
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In the case of refraction if CD is the refracted wave front and v 1 and v 2 are the speed of light in the two media, then in the time the wavelets from B reaches C , the wavelet from A will reach D , such that
.....(i)
But in 
.....(ii)
while in 
.....(iii)
From equations (i), (ii) and (iii) 
Also 
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