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What will happen if the monochromatic source of light is replaced by a white light in Young's double slit experiment

What will happen if the monochromatic source of light is replaced by a white light in Young's double slit experiment Correct Answer Colored fringes will be observed with a bright white fringe at the center

The correct answer is option 3) i.e. Colored fringes will be observed with a bright white fringe at the centre.

CONCEPT:

  • Young's double-slit experiment: It uses two coherent monochromatic sources of light separated by a very small distance, usually, of the order of magnitude slightly greater than the wavelength of light used in the experiment.
    • It is used to study the wave nature of light.
  • Coherent monochromatic sources of light are the sources that emit lights of the same frequency and waveform and have a constant phase difference between them.

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EXPLANATION:

  • White light is composed of seven constituent colours namely, violet, indigo, blue, green, yellow, orange and red that have different wavelengths.
  • If white light will be used in the experiment the different colours of different wavelengths will bend differently and form fringes of their respective colour.
  • The central fringe will be formed as a result of constructive interference of all the colours and will appear white.
  • Hence, if monochromatic light is replaced by a white light, coloured fringes will be observed with a central bright white fringe.

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