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Unit 2 Mechanics, materials and waves

Section 13 – Optics 13.7: The diffraction grating. Learning objectives. Describe how diffraction gratings affect a light ray Recall some applications of diffraction gratings Use and describe the meaning of n λ = d sin θ. Unit 2 Mechanics, materials and waves.

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Unit 2 Mechanics, materials and waves

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  1. Section 13 – Optics 13.7: The diffraction grating Learning objectives • Describe how diffraction gratings affect a light ray • Recall some applications of diffraction gratings • Use and describe the meaning of nλ=dsinθ Unit 2 Mechanics, materials and waves

  2. Review: Changing W, D, λ and s • http://vsg.quasihome.com/interfer.htm • http://www.walter-fendt.de/ph14e/doubleslit.htm

  3. Huygens theory of wave propagation

  4. Explain these diffraction patterns using Huygens’ theory

  5. 0 order 1st order 2nd order 3rd order

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