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Study the interference of light using Helium - Neon Diode Laser.
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AIM TO STUDY THE INTERFERENCE OF LIGHT BY USING HELIUM -DIODE LASER COHERENT SOURCES As we see later, light waves from a sodium lamp, for example, are due to energy changes in the sodium atoms. The emitted waves occur in bursts lasting about second. The light waves produced by the different atoms are out of phase with each other, as they are omitted randomly and rapidly. We call such sources of light waves as these atoms incoherent sources on account of the continual change of phase. Two sodium lamps X and Y both emit light waves of the same colour or wavelength. But owing to the random emission of light waves from their atoms, their resultant light waves are constantly out of phase. So X and Y are incoherent sources. Coherent sources are those which emit light waves of the same wavelength or frequency which are always in phase with each other or...
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