Physics Revision

• Calculating critical angle for glass

  1. Given: Refractive index of glass = 1.52

  2. Light passes through an optical fibre made of glass

  3. Calculate critical angle
• Calculating frequency of laser light

  1. Given: Wavelength of laser light = 602 nm

  2. Speed of light in air = 3 x 10⁸ m/s

  3. Calculate frequency
• Calculating tension in a string

  1. Given: Wave speed = 17.3 m/s

  2. Mass per unit length of string = 0.3 kg/m

  3. Calculate tension
• Longitudinal wave


  Definition
• Digital signal


  Definition
• Diffraction grating


  Definition
• Path difference


  Definition
• Endoscope


  Definition
• Emission spectra


  Definition
• Mechanical wave


  Definition
• Optical fibres bent to very sharp angle

  Brightness of light leaving optical fibres is reduced
• Longitudinal wave


  Difference from transverse wave
• Two pebbles dropped into pool


  Interference patterns seen
• Coherent light source


  Definition