Required practical 2 - Diffraction grating

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Last updated 11:25 AM on 6/4/26
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Apparatus and Equipment for experiment

Equipment:

  • Laser

  • Diffraction grating

  • White screen

  • Metre ruler

<p>Equipment: </p><ul><li><p>Laser </p></li></ul><ul><li><p>Diffraction grating</p></li></ul><ul><li><p>White screen </p></li></ul><ul><li><p>Metre ruler</p></li></ul><p></p>
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Step 1 of experiment

Ensuring that the laboratory is partially darkened, set up the apparatus as shown in the diagram

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Step 2 of experiment

Adjust the apparatus so that D is 1.000m, measured using the metre ruler.

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Step 3 of experiment

Measure the distances and on either side of the central maximum using the h1 h2 ruler and find the mean of each of them

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Graphs and calculations

  • Work out the slit separation by finding the reciprocal of the number of slits per metre quoted on the diffraction grating.

  • Find θ1 and θ2 by using θn = tan-1 (hn/D)

  • Find λ from both of these angles using λ=dsin(θ)/n and then calculate the mean.

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Safety

Shining a laser into someone’s eyes can be dangerous, so ensure that the lasers are pointed away from them

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Improvements and notes

Make sure that the screen and double slit are aligned perfectly normal to the laser to avoid parallax error in the measurement of the fringe width. A set square can be used in conjunction with the ruler