Two independent right sources cannot act as independent coherent sources .justify
Asked by teerth17 | 14th Jul, 2015, 12:15: AM
The two independent light sources cannot act as coherent sources because light is emitted from individual atoms, when they return to the ground state after being excited by heat or electric discharge. Even the smallest source of light contains billions of such atoms which cannot emit light waves in same phase. Such independent sources of light waves do not possess a constant phase difference i.e. it continuously keeps on changing with time are called non-coherent sources or incoherent sources.
Two sources of light are said to be coherent, if they emit light waves of same frequency or wavelength and of a stable phase difference.
Answered by Faiza Lambe | 14th Jul, 2015, 09:13: AM
- What are coherent sources? Can two identical and independent sodium lamps act as coherent sources? Give reason for you answer.
- Write two essential conditions for obtaining two coherent sources of light.
- Two coherent light beams are made to interfere and produce interference fringes. If the intensity of one beam is twice that of the other, then what will be the visibility of fringes?
- Plot an intensity on screen vs. phase difference graph for the interference pattern obtained in Young's double slit experiment, when: a. Two sources are coherent with each other. b. Two sources are coherent with each other, but a slit against one of the sources is closed.c. Two sources are incoherent with each other
- How can coherent sources be obtained?
- Explain the methods of producing coherent sources?
- Rays from the coherent sources reach certain point with a path difference of (3λ/2). will the point be dark or bright?
- How do you obtain coherent sources in Fresnel's biprism?
- Prove Snell's law of refraction using Huygen's principle.
- State the reason, why two independent sources of light cannot be considered as coherent sources.
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