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What is wavelet and secondary wavefront?

Wavelet: Wavelets are tiny parts of waves.

Define wavefront?

Wavefront : A wavefront can be defined as the locus of all the points of the medium which are vibrating in phase and are also displaced at the same time.

What is diffraction grating?

Diffraction grating : Diffraction grating is an extremely useful device. In one of its form it consists of a very large number of narrow slits side by side. The slits are separated by opaque spaces.

What do you mean by Fresnel and Fraunhofer class of diffraction?

Diffraction phenomena can conveniently divided into two groups.

What is diffraction? Explain.

Diffraction : The rhythmic variations in intensity and the bending of light around the corners of an obstacle or the encroachment of light into the region of geometrical shadow constitute a class of phenomena known as the diffraction of light.

What are the Newton’s rings and how are they formed?

Newton’s rings and its formation : When a Plano-convex lens of long focal length is placed on a plane glass plate, a thin film of air is enclosed between the lower surface of the lens and the upper surface of the plate. The thickness of the air film is very small at the point of contact and gradually increases from the centre outwards. 

What is fringe width?

Fringe width : The distance between any two consecutive bright or dark fringe is known as fringe width. Symbolically the fringe width is β and

Why two independent source of light can not produce interference?

Two independent sources of light can not produce interference because a large number of difficulties are involved. The two sources may emit light waves of largely different amplitude and wave length and the phase difference between the two may change with time. That’s why interference of light is produced by two coherent sources which are virtual.

What do you mean by coherent sources? How are they realized in practice?

Coherent sources : Two sources are said to be coherent if they emit light waves of same frequency, nearly equal amplitude and are always in phase with each other.

Define and explain interference of light.

Interference of light: Wave emitted from two coherent sources having the same wavelength, equal or nearly equal amplitude when passes through a point in a medium, then superposition takes place. 

Explain Huygens principles.

Huygens principle : To explain the propagation of light through ether, Huygens proposed the following principles for the construction of a wavefront at a subsequent time from the known position of the wavefront at any given instance.

What are stationary waves?

Stationary waves: When two simple harmonic waves of the same amplitude, frequency and time period travel in opposite directions in a straight line, the resultant wave obtained is called a stationary or a standing wave. The formation of stationary waves is due to the superposition of the two waves on the particles of the medium.

What are transverse and longitudinal waves?

Transverse waves:  In transverse wave motion, the particles of the medium vibrate at right angles to the direction of propagation of wave.

          Example: Light waves are transverse waves.
Longitudinal wave motion: In longitudinal wave motion, particles of the medium vibrate along the direction of propagation of the wave.

          Example: Sound waves are longitudinal waves.

Define wave motion?

Wave motion: Wave motion is a form of disturbance produced in the medium by the repeated periodic motion of the particles of the medium. Here, only the waves travel forward whereas the particles of the medium vibrate about their mean positions.

What is resonance?

Resonance:  When the forced frequency is equal to the natural frequency of vibration of the body, resonance takes place. Resonance is a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibrations as the natural frequency of the resonating system.

What are undamped free vibrations, damped free vibrations and forced vibrations?

Undamped free vibrations: When a bob of a simple pendulum (in vacuum) is displaced from its mean position and left, it executes simple harmonic motions. The pendulum will continue to oscillate with the same time period and amplitude for any length of time. In such cases there is no loss of energy by friction or otherwise. In all similar cases, the vibrations will be undamped free vibrations.

What are Lissajous’ figure?

Lissajous’ figure: When a particle is influenced simultaneously by two simple harmonic motions at right angles to each other, the resultant motion of the particle traces a curve. These curves are called Lissajous’ figure.

What is simple harmonic motion?

Simple harmonic motion: The type of motion where the acceleration is directed towards a fixed point (the mean position of rest) and is proportional to the displacement of the vibrating particle is called simple harmonic motion.

What is entropy?

Entropy: The term ‘Entropy’ is a Greek word and means transformation. Entropy is a physical property or nature of a substance that remain constant in an adiabatic process. It is a quantity that increases with the application of heat in a reversible manner.

Describe Carnot’s reversible engine.

Carnot’s reversible engine : In 1824, Sadi Carnot conceived a closed reversible cycle consisting two strokes. Since that Carnot’s cycle reversible because it consists two isothermals and two adiabatic, all of which are reversible process.

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