The refractive index of four materials A,B,C and D are 1.3, 1.43, 1.71 and 1.52 respectively. When the light rays pass from air into these materials, they refract the minimum in:

The refractive index of four substance A,B, C and D are 1.31, 1.43 , 1.33 , 2.4 respectively . The speed of light is maximum in

The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is minimum in ......

The refractive indexes of four substances P,Q,R and S are 1.77, 1.52, 1.65 and 1.36 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in:

The refractive indices of a material for red, violet and yellow colour lights are 1.52, 1.62 and 1.59 respectively. Calculate the dispersive power of the material. If the mean deviation is 40^@ what will be the angular dispersion produced by a prism of this material ?