and . The refractive index of glass with respect to air will be equal to

a) |
b) |
c) |
d) |

and . The refractive index of glass with respect to air will be equal to

a) |
b) |
c) |
d) |

1 Answer

127 votes

**(b)**

In the case of refraction if is the refracted wave front and and are the speed of light in the two media, then in the time the wavelets from reaches , the wavelet from will reach , such that

But in …(ii)

While in …(iii)

From equations (i), (ii) and (iii)

Also

127 votes

127