Chapter 13 - Light Waves Flashcards Preview

Edexcel GCSE Physics > Chapter 13 - Light Waves > Flashcards

Flashcards in Chapter 13 - Light Waves Deck (7)
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1
Q

What is refraction? (1)

A
  • change in direction of waves at a boundary
2
Q

State the equation linking refractive index, angle of incidence and angle of refraction (1)

A

refractive index = sin i / sin r

3
Q
A
  • Draw around block
  • Mark positions of incident and emergent rays
  • remove block and draw refracted ray
  • measure i and r
  • measure angles to the normal
  • range of values
4
Q

State two conditions required for total internal reflection to happen [2 marks]

A
  • Must be more (optically) dense to less (optically) dense change
  • Angle of incidence > critical angle;
5
Q

Suggest one advantage of sending signals using optical fibres [1 marks]

A
  • Less prone to noise
6
Q
A

D

7
Q

State two ways in which light waves change as they pass into the glass (2)

A
  • waves slow down
  • waves change direction/bend/angle;
  • wavelength decreases;