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youngs double slit experiment third secondary maxima what does m=?

youngs double slit experiment

third secondary maxima

what does m=?

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Answer #1

Usually, m denoted order number. The diffraction pattern consists of a central bright fringe (central maxima) surrounded by dark and bright lines (called secondary minima and maxima)

there are (N- 1) minima between two successive principal maxima. Hence there are (N -2) other maxima coming alternatively with the minima between two successive principal maxima. These maxima are called secondary maxima.

a*sin(theta) = m*lamda

For third secondary, m = 3

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