Lesson 9 — Refraction

• Refraction
• Middelbare school
• havo, vwo
• Leerjaar 2

Refraction

This lesson

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

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

what is the law of reflection?

Checking the worksheet

The law of reflection

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

A demonstration

Refraction

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

Link

Refraction

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

Link

refractiveindex=​speedoflightmedium​​speedoflightvacuum​​

refractiveindex=​speedoflightmedium​​speedoflightvacuum​​

n=​v​​c​​

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

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.

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