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2. What is the formula for the Refractive Index?

  • Refractive Index = sin (r) x sin (i)
  • Refractive Index = sin (r) / sin (i)
  • Refractive Index = sin (i) / sin (r)
  • Refractive Index = sin (i) x sin (r)

3. Which of these are uses of Infra-red?

  • Sterilizing Food and Medical Equipment
  • Heating and Night-vision Equipment
  • Broadcasting and Communications
  • Cooking and Satellite Transmissions

4. What is the unit used for Frequency?

  • m
  • Hz
  • s
  • m/s

5. What is the Period of a wave?

  • The time it takes for one complete wave.
  • The number of waves that travels past a point in one second.
  • The height of the wave from the middle to a peak or trough.
  • The length of one complete wave.
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