First slide

Coherent sources and their importance in interference

Question

Consider the Young’s Double Slit Experiment arrangement shown in figure. If $d = 10 λ$ then position of $8^{th}$ order maxima is $y = \frac{p}{3} D$ . Find the value of $p$ .

Moderate

Solution

Given
Distance between two slits $= 10 λ$
For maxima $d \sin θ = n λ$
$\begin{array}{l} \sin θ = \frac{n λ}{d} = \frac{8 λ}{10 λ} \Rightarrow \sin θ = \frac{4}{5} \Rightarrow \tan θ = \frac{4}{3} \\ Also \tan θ = \frac{y}{D} \\ ∴ y = \frac{4 D}{3} \end{array}$
Therefore, $p = 4$

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