Q45 / 50 · Manipal (MET) 2023 · Physics

In Young's double slit experiment, if the source of light changes from orange to blue, then

  • A
    the central bright fringe will become a dark fringe
  • Correct answer
    B
    the distance between consecutive fringes will decrease
  • C
    the distance between consecutive fringes will increase.
  • D
    the intensity of the minima will increase.

Solution

We know that in Young's double slit experiment, fringe width $\beta=\frac{D \lambda}{d}, \beta \propto \lambda$ Since, $\lambda_{\text {blue }} \lt \lambda_{\text {orange }}$ Thus, $\beta_{\text {blue }} \lt \beta_{\text {orange }}$ $\therefore$ In Young's double slit experiment, if the source of light changes from orange to blue, then distance between the consecutive fringes will decrease.

Hence, the correct answer is option: 'B'.

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