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physics Advanced Subsidiary (AS) Level Physics.
 
Solved problems for the chapter:
 

Determining the Wavelength of Light using a Diffraction Grating

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Diffraction Grating
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Example 1.

A beam of light of wavelength 600 nm is propagated perpendicular to a diffraction grating with a grating spacing of .

  • What is the greatest possible order of the maximum?

  • If the diffracted beam is observed on a screen 1 m away, what is the distance between the first

    () and the second () order maxima?

    
Example 2.

A beam of white light falls on a diffraction grating with a grid of 300 slits per millimeter. If the interference image is obtained on a screen 2 m away, calculate:

  • the heights of the first-order maximum measured from the grid bisector.

  • the heights of the second-order maximum measured from the grid bisector.

  • the height of the undeviated light beam.

    
3.

A diffraction grating is 4 mm high and has 2000 slits. It is illuminated with a laser light perpendicular to the diffraction grating. On a screen 0.5 m away, the first-order maximum with a height of 0.187 m is produced. What is the wavelength of the laser light?

    
4.

A deflection grid has a grating constant of . On a screen 1 m away, the first-order maximum image is produced at a height of 0.15 m.

  • What is the frequency of the incident light?

  • What should be the grating constant for the height of the maximum to be doubled?