Lesson 11 — Refraction



Refraction
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Slide 1: Tekstslide
RefractionMiddelbare schoolhavo, vwoLeerjaar 2

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Refraction

Slide 1 - Tekstslide

This lesson
  • Exercise refractive index
  • Refraction – glass to air
  • Total internal reflection
  • Quizizz

Slide 2 - Tekstslide

Goals
  • Describe what refraction is
  • Explain why refraction causes the image of an object to get deformed using a ray diagram
  • Explain what the refractive index is
  • Apply the refractive index
  • Explain total internal reflection and the critical angle

Slide 3 - Tekstslide

Refraction 
  • Incident ray
  • Reflected ray
  • Refracted ray

  • Angle of incidence
  • Angle of reflection
  • Angle or refraction

Slide 4 - Tekstslide

refractiveindex=speedoflightmediumspeedoflightvacuum

Slide 5 - Tekstslide

Exercise
See the speed of light in the following materials:
  • Speed of light glass: 200 000 000 m/s
  • Speed of light water: 225 000 000 m/s
  • Speed of light plastic: 190 000 000 m/s

Imagine a light ray going from vacuum into one of these materials. Order these  materials on how much they bend the light from strongest to weakest.

Slide 6 - Tekstslide

Why does the refractive index have no unit?

Slide 7 - Tekstslide

refractiveindex=speedoflightmediumspeedoflightvacuum
n=vc
  • Refractive index (n) — no unit
  • Speed of light vacuum (c) — m/s
  • Speed of light medium (v) — m/s

Slide 8 - Tekstslide

Refraction — glass to air

Slide 9 - Tekstslide

Lower to higher 
refractive index
Higher to lower refractive index
Bends towards the normal line
Bends away from the normal line

Slide 10 - Tekstslide

Total internal reflection

Slide 11 - Tekstslide

Slide 12 - Tekstslide

Goals
  • Describe what refraction is
  • Explain why refraction causes the image of an object to get deformed using a ray diagram
  • Explain what the refractive index is
  • Apply the refractive index
  • Explain total internal reflection and the critical angle

Slide 13 - Tekstslide