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In a young`s double slit experiment'slits are seperated by 0.5mm, and the screen is place 150 cm away. A beam of light consisting of two wavelengths, 650nm and 520 nm, is used to obtain fringes on the screen . the least distance from common central maximum to the point were the bright fringes due to both the wavelngths coincide is
Asked by ppavani198 | 29 Dec, 2018, 06:37: PM
Expert Answer
Let λ1 = 650 nm and λ2 = 520 nm are the two wavelenths present in the light beam.
Let bright fringe number n1 of λ1 coincide with fringe number n2 of λ2 .
Let D is the distance between slit and screen and d is interdistance between slits.
Then we have
Hence the required minimum distance from central maximum is
Answered by Thiyagarajan K | 30 Dec, 2018, 10:42: AM
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