To find the separation of a pair of double slits using youngs experiment.

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BACKGROUND INFORMATION:

Youngs experiment involved sunlight being allowed to pass through a pinhole, S and then at a considerable distance away , through pinholes S1 and S2. The two sets of spherical waves emerging from the two holes interfered with each otherinsuch a way as to form a symmetrical pattern of varying intensity on the screen AC. This experiment is shown below

 The mathematical formula that was derived from this experiment is Λ = (a * y)/D, which can be re- arranged so that the seperation of the two slits is the subject of the equation,

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 a = (λ * D)/y

EQUIPMENT:

  • Monochromatic light (red laser)
  • Measuring tape
  • Double slit
  • Piece of paper
  • Pen

PROCEDURE:

  1. Set up the apparutus as per the diagram below:

  1. Turn on the Monochromatic light and put the double slit in place so that an image similar to the one below is visible on the paper

  1. Mark with a pencil the centre of 10 of the lines projected on the paper
  2. Measure the distane,D between the laser and the paper, and record as ‘D’
  3. Measure the distance ...

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