MHT-CET : Physics Entrance Exam

### MHT - CET : Physics - Interference of Light Glossary

 ·                     Principle of Superposition of Waves: When two or more waves, travelling through a medium, arrive at a point of the medium simultaneously, each wave produces its own displacement at that point, independently of the other wave. ·                     Interference of Light: The redistribution of intensity of light due to the superposition of the waves of light. It was discovered by Thomas Young in 1801. ·                     Coherent Sources: Sources that emit light with constant phase difference. ·                     Monochromatic Light: Light consisting of one wavelength. ·                     Fringes: The alternate bright and dark bands in an interference pattern. ·                     Band Width: The width of an adjacent dark and bright band. The distance between two consecutive dark or bright bands. ·                     Biprism: A system of two prisms attached base to base and having very small refracting angle. ·                     Path difference (Dx) and Phase difference (Df): They are related by the equation Df = ·                     Constructive Interference: If two waves of light, arriving simultaneously at a point, are in phase, the crest due to one wave coincides with the crest due to the other and the trough due to one wave coincides with the trough due to other. Therefore, the resultant displacement and hence the resultant intensity of light at that point is maximum and the point is bright. This phenomenon is called constructive interference. ·                     Destructive Interference: If two waves of light, arriving simultaneously at a point, are in opposite phase, the crest due to one wave coincides with the trough due to the other and vice versa. Therefore, the resultant intensity at that point is minimum and the point is dark. This phenomenon is called destructive interference.

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