Inaccuracies

• Why angle i is NOT equal to angle r in ray experiment:

  • Thickness of pins
  • Thickness of mirror
  • Protractor is not precise
• Inaccuracy of ray box method: thickness of rays.
• Inaccuracy of pin method: pins not straight, or too close, or thickness of lines drawn.
• Measuring 10 oscillations rather than 1:

  • Reduce human errors
  • Give more accurate value of time taken (T)
  • Gives an average of