## Explain red and blue shift.

Red shift: When the source is receding away from the observer, then the frequency of light appears to be decreasing or the wavelength of light appears to be increasing to the observer. Therefore, the spectral line gets displaced towards red […]

## What is a polaroid?

A large sheet of synthetic material packed with tiny crystals of a dichroic substance oriented parallel to one another so that it transmits light only in one direction of the electric vector is called a polaroid.   […]

## State Brewster’s law.

The tangent of the polarising angle is equal to the refractive index of the refracting medium at which partial reflection takes place. According to Brewster’s law, tan ip = μ  State the main uses of polaroids. For Question and answer […]

## Define unpolarised light? Give its symbolic representation.

Unpolarised light: A light in which the vibrations of the electric vectors are in all possible directions, which are perpendicular to the directions of propagation is called as unpolarised light. Symbolic representation of unpolarised light is as shown in figure […]

## What do you mean by polarisation?

Polarisation: The phenomenon of restriction of the vibration of light waves in a particular plane perpendicular to direction of wave motion is called polarisation of light. Define unpolarised light? Give its symbolic representation. For Question and answer of other subject […]

## Explain refraction of light on the basis of wave theory. Hence prove laws of refraction .

Laws of refraction Ratio of velocity of light in rarer medium to velocity of light in denser medium is a constant called refractive index of denser medium w.r.t. rarer medium. The incident rays, refracted rays and normal lie in the […]

## Give a brief account of Huygens’ wave theory of light.

Huygens’ wave theory of light: In 1678, Dutch physicist Christian Huygens proposed a theory to explain the wave nature of light. This theory is called Huygens’ wave theory of light. According to wave theory of light, a source of light […]