First slide

Young's double slit Experiment

Question

In Young’s double slit experiment, the wavelength of red light is $7.8 \times 10^{- 5} c m$ and that of blue light is $5.2 \times 10^{- 5} c m .$ The value of ‘n’ for which
${(n + 1)}^{t h}$ blue bright band coincides with $n^{th}$ red bright band is

Moderate

Solution

$\frac{(n + 1) \times λ_{b} . D}{d} = \frac{n \times λ_{r} . D}{d} \Rightarrow (n + 1) \times 5.2 = n \times 7.8 \Rightarrow n = 2$

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