Lesson 9 — Refraction



Refraction
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Refraction

Slide 1 - Diapositive

This lesson
  • Checking the worksheet
  • What is refraction?
  • The key parts of 6.6

Slide 2 - Diapositive

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 and use it to explain refraction
  • Apply the refractive index

Slide 3 - Diapositive

what is the law of reflection?

Slide 4 - Diapositive

Slide 5 - Diapositive

Checking the worksheet

Slide 6 - Diapositive

The law of reflection
  • Incident ray
  • Reflected ray
  • Angle of incidence
  • Angle of reflection
  • Normal line


Slide 7 - Diapositive

A demonstration

Slide 8 - Diapositive


Refraction

  • When light goes from one material to another it gets bend according to the refractive index

Slide 9 - Diapositive


Refraction

  • When light goes from one material to another it gets bend according to the refractive index

Slide 10 - Diapositive

refractiveindex=speedoflightmediumspeedoflightvacuum

Slide 11 - Diapositive

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

Slide 12 - Diapositive

Slide 13 - Diapositive

Slide 14 - Diapositive

Exercis
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 the materials on how much they bend the light from strongest to weakest.

Slide 15 - Diapositive

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 and use it to explain refraction
  • Apply the refractive index

Slide 16 - Diapositive