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CAIE A-Level Physics 8.2 Diffraction

Practise defining diffraction, interpreting experiments and predicting how aperture width and wavelength affect the spreading pattern.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • define diffraction and identify its spreading behaviour around apertures or obstacles
  • describe or interpret diffraction experiments and relate the pattern qualitatively to gap width and wavelength

Covered syllabus points

8.2.1—The meaning of the term diffraction8.2.2—Experiments that demonstrate diffraction including the qualitative effect of

8.2 Diffraction question 1

[Maximum number: 2]

A diffraction grating is used to determine the wavelength of light.

Describe the diffraction of light at a diffraction grating.

8.2 Diffraction question 2

[Maximum number: 2]

Interference fringes may be observed using a light-emitting laser to illuminate a double slit. The double slit acts as two sources of light.

Explain

the part played by diffraction in the production of the fringes,

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