MHT CET 2020 :: Physics :: General questions

• Physics - General questions

 A light wave of wavelength  $\lambda$  is incident on a slit of width d. The resulting diffraction pattern is observed on a screen at a distance of D. If the linear width  of the principal  maxima is equal to the width  of the slit, then the distance D is 

Answer:

Explanation:

 The linear width of the principal maxima,

$\beta=\frac{2D\lambda}{d}$

 It is given that, the linear width of the principal maxima is equal to the width of the slit.

$\therefore$     $d=\frac{2D\lambda}{d}\Rightarrow D=\frac{d^{2}}{2\lambda}$

• Physics - General questions