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Physics I

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 …

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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. Realization in practice In practice it is not possible to have two independent sources which are coherent. But for experimental purpose, two virtual sources formed by a …

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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.  During superposition, if the two waves reaching the point in the same phase then the intensity will be maximum that is bright. But if the …

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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. Every point on a primary wavefront may be considered as the secondary source of disturbance. Secondary waves or wavelets …

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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.

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