The refractive index of glass for light going from air to glass is . The refractive index for light going from glass to air will be:

The refractive indices of four substances P, Q, Rand S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance:

The refractive indices of four materials A, B, C and D are 1.03, 1.13, 1.92 and 1.72 respectively. When the light rays pass from air into these materials, they refract the maximum in:

The refractive indices of four media A, B, C and Dare 1.44, 1.52, 1.65 and 1.36 respectively. When light travelling in air is incident in these media at equal angles, the angle of refraction will be the minimum:

The speed of light in substance X is 1.25 x 10⁸ m/s and that in air is 3 x 10⁸ m/s. The refractive index of this substance will be: