P4 Physics pg 97

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  • Diffraction patterns and polarisation
    • When waves of equal frequency or wavelength overlap you get interference patterns
      • When a wavefront passes through a gap, light from points along the gap diffracts
      • The light won't diffracy much if the gap isn't the same size as the wavelength
      • The diffracted light from each point interferes with light from all the other points
    • Particle theory explains the nature of light - 17th century, 2 theories
      • The particle theory of light could explain reflection and refraction
      • Thomas Young's experiement showed that light could diffract and interfere
        • A coherent light source showing constructive and destructive interference
    • Transverse waves can be plane polarised
      • Vibrations are at 90 degrees to the directino of the travel of the wave
      • plane polarised light is made up of vibrations in one direction
      • where the only vertical vibrations is one direction are transmitted
        • When light is reflected from some surfaces it is partly polarised

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