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# Reflection and refraction

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by

## Liam Fishwick

on 14 April 2016

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#### Transcript of Reflection and refraction

Refraction
Total internal reflection
Optical fibres
Plenary
Research Galileo and his telescope. How does that link to today's lesson?
Objectives
Homework
I am now able to:
Recall the law of reflection (E)

Describe what happens to a wave at a boundary (C)

Explain refraction in terms of change of speed and direction at a boundary, link this to total internal reflection (A/A*)
What happens when we have a semi-circular block?

Can you make the red line happen?

What angle does it happen at?

Where could this be useful?
Now use the glass block and try to make these two diagrams.
Measure the angles of incidence and refraction
Recall the law of reflection (E)

Describe what happens to a wave at a boundary (C)

Explain refraction in terms of change of speed and direction at a boundary, link this to total internal reflection (A/A*)

Reflection and refraction
Experiment:
Can you find a link between the angle of incidence and angle of reflection?
Measure the incident and reflected angle for several incident angles.
Reflection
When light reaches a different medium it changes speed.
This causes light to change direction.

This is due to the density of the material.

What happens to light at a boundary?
Starter:
Can you draw a ray diagram?
How do you see the board?

What did you find out?
What is the law of reflection?
incident ray
refracted ray
normal
Can you explain refraction?
1. Write a sentence to describe what happens to light at a boundary based upon your results.

2. Explain what causes the changes you see.

3. Link this to the wave equation. (Frequency never changes)
How many points did you make?
Light changes direction when changing medium.
Light travels slower in more dense media.
Ray bends towards normal when going from less dense to more dense (air to glass).
Ray bends away from normal when going from more to less dense (glass to air).
Wavelength changes because speed has changed.
Where is this useful?
To improve I need to ........
How can we remember this?

T
owards
A
ir
G
lass
A
way
G
lass
A
ir
Can you explain this video....
This doesn't just happen with light....
Draw a ray diagram to show how you see the board
Why is the writing backwards?
Remember the rules of drawing ray diagrams!
Exam question
Complete the exam question
Full transcript