Ray Optics Test...

Electromagnetic radiation of frequency n, wavelength λ, travelling with velocity v in air, enters a glass slab of refractive index µ. 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 µ = 3 by light?

In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should be microscope moved to get the mark in focus again?

The reason of seeing the Sun a little before the sunrise is

Velocity of light in glass whose refractive index with respect to air is 1.5 is 2 × 10⁸ m/s and in certain liquidthe velocity of light found to be 2.5 × 10⁸ m/s. The refractive index of the liquid with respect to air is

A fish at a depth of 12 cm in water is viewed by an observer on the bank of a lake. To what height the image of the fish is raised?

A thin oil layer floats on water. A ray of light making an angle of incidence of 40° shines on oil layer. The angle of refraction of light ray in water is (µ_oil = 1.45, µ_water = 1.33)

An object is immersed in a fluid. In order that the object becomes invisible, it should

When light travels from glass to air, the incident angle is θ₁ and the refracted angle is θ₂. The true relation is