If the absolute refractive indices of water and glass are 4/3 and 3/2 respectively, then what will be the ratio of velocity of light in water to that of glass?

If the absolute refractive indices of water, benzene, and sapphire are 1.33, 1.50 and 1.77 respectively, then which medium has maximum relative refractive index?

Which type of an image is formed by a plane mirror?

The absolute refractive indices of water glass and diamond are 1.77, 1.50 and 2.42 respectively, which medium is most optically denser?

Which of the following always form virtual image?