Questions in Ray Optics and Optical Instruments

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The time required to pass the light through a glass slab of $2 mm$ thick is (${{\mu }_{glass}}=1.5$)
The refractive index of water with respect to air is $4 / 3$ and the refractive index of glass with respect to air is $3/2$. The refractive index of water with respect to glass is
Electromagnetic radiation of frequency $n$, wavelength $\lambda $, travelling with velocity v in air, enters a glass slab of refractive index $\mu $. The frequency, wavelength and velocity of light in the glass slab will be respectively
What is the time taken (in seconds) to cross a glass of thickness $4 mm$ and $\mu $= 3 by light
A plane glass slab is kept over various coloured letters, the letter which appears least raised is
A ray of light is incident on the surface of separation of a medium at an angle 45° and is refracted in the medium at an angle 30°. What will be the velocity of light in the medium
Absolute refractive indices of glass and water are $\frac{3}{2}$ and $\frac{4}{3}$. The ratio of velocity of light in glass and water will be
The ratio of thickness of plates of two transparent mediums A and B is 6 : 4. If light takes equal time in passing through them, then refractive index of B with respect to A will be
The refractive index of water and glass with respect to air is 1.3 and 1.5 respectively. Then the refractive index of glass with respect to water is
A tank is filled with benzene to a height of 120 mm. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be 80 mm. The refractive index of benzene is

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