First slide

Young's double slit Experiment

Question

In Young’s double slit experiment the wavelength of light used is 500 nm. If the path difference between waves reaching a point P on the screen is 1.5 microns, then at that point P

Moderate

Solution

$\begin{array}{l} If path difference, x = n λ, then bright band will form \\ and If x = (2 n - 1) \frac{λ}{2} then n th dark band will form \\ 1.5 \times 10^{- 6} = n 500 \times 10^{- 9} \\ n = 3 \\ i . e . 3 rd bright band \end{array}$

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