## 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 […]

## State Huygens’ principle.

It is the geometrical construction to determine new position of a wave front at any later instant from its position at any earlier instant. Statement: i. Every point on the primary wave front acts as a secondary source of light […]

## State the main characteristics of wave normal & Wave front.

Characteristics of wave normal I. It gives the direction of propagation of wave. II. It is perpendicular to wave front. III. In a homogeneous isotropic medium, wave normal is same as direction of ray of light. IV. It is drawn […]

## Define the term of wave front, wave normal and wave surface.

Definition: Wave front: A locus of all the points of the medium to which waves reach simultaneously so that all the points are in the same phase is called wave front. Wave normal: A perpendicular drawn to the surface of […]

## State the merits and demerits of Huygens’ wave theory of light.

Merits of Huygens’ wave theory of light: It gives satisfactory explanation for laws of reflection, refraction and double refraction of light assuming transverse nature of the light waves. It also explains the theory of interference and diffraction. It explains the […]