A diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then

A diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then
  1. no change in diffraction pattern.
  2. diffraction bands become narrow and crowded together.
  3. diffraction bands become broader and farther apart.
  4. bands disappear.

Solution

For diffraction, Distance between successive maxima is given $\begin{aligned} & \text { by, } \beta=\frac{\lambda \mathrm{D}}{\mathrm{a}} \Rightarrow \beta \propto \lambda \\ & \lambda_{\text {blue }} \lt \lambda_{\text {red }} \end{aligned}$ $\therefore \quad$ The diffraction bands become narrow and crowded together. .

Asked in: MHT CET 2024 (02 May Shift 2)

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