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Concepts Of Physics MCQ Edition [Volume 1]PhysicsLight Waves

If the light source utilized in a Young's double slit experiment is changed from red to violet,

Options

  1. Athe fringes will become brighter
  2. Bconsecutive fringes will come closer together
  3. Cthe central bright fringe will turn into a dark fringe
  4. Dthe intensity of the minima will increase

Correct answer

B. consecutive fringes will come closer together

Step-by-step solution

The fringe width in Young's double slit experiment is given by = D d , where is the wavelength of the light used, D is the distance between the slits and the screen, and d is the distance between the two slits. The wavelength of red light is greater than the wavelength of violet light ( _ red > _ violet ). Since the fringe width is directly proportional to the wavelength ( ), decreasing the wavelength by changing the light from red to violet will decrease the fringe width. Therefore, the consecutive fringes will co

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