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COMEDK2013PhysicsWave Optics

In Young's double slit experiment, if monochromatic light used is replaced by white light, then

Options

  1. Ano fringes are observed
  2. Bonly central fringe is white, all other fringes are coloured
  3. Call bright fringes become white
  4. Dall bright fringes have colours between violet and red

Correct answer

B. only central fringe is white, all other fringes are coloured

Step-by-step solution

When the monochromatic light in Young's double slit experiment is replaced by white light, a white central bright fringe is observed as all wavelengths of light have zero phase difference at centre while at all other points, it is different for different colours. So different colour fringes are observed on both sides.

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