First slide

Diffraction

Question

A beam of light of wavelength 600nm from a distant source falls on a single slit 1.0mm wide and the resulting diffraction pattern is observed on a screen 2m away. What is the width of central maximum?

Moderate

Solution

$\begin{array}{l} The distance of 1st minimum from centre of primary maximum is \\ y_{1} = \frac{λD}{d} = \frac{6 \times 10^{- 7} \times 2}{1 \times 10^{- 3}} = 1 .2 mm \\ width of central maximum w = 2 y_{1} = 2 .4 mm \end{array}$

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