1. Unit 6F: How we see things

2. Unit 6F: How we see things
Unit 6F: Vocabulary
Some useful words
Opaque
Reflect
Reflection
Light beam
Mirror
Light travelling
A material that light cannot pass through
When light ‘bounces’ off a surface in particular shiny surfaces such as mirrors
An image viewed in a mirror, for example
A thin column of light such as projected by a torch
A shiny surface that reflects light
Light is always moving V
Unit 6F: How we see things

3. Unit 6F: How does light travel?
Unit 6F: How does light travel?: L.O. 1, 2: N.C. 4.3a

4. Unit 6F: How does light travel?
Unit 6F: How does light travel?: L.O. 1, 2: N.C. 4.3a

5. Unit 6F: How do we see things?
Unit 6F: How do we see things?: L.O. 3: N.C. 4.3d

6. Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3cD
Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c

7. Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3cD
Unit 6F: Reflection: L.O. 4, 5: N.C. 4.3c

8. Unit 6F: More reflections
When light is reflected it’s direction of travel changes
angle i = angle r D
Unit 6F: More reflections: L.O. 6, 7: N.C. 4.3c

9. Unit 6F: Shiny and dull surfaces
You are going to investigate what types of surfaces reflect light the best, shiny or dull.
Test each of the surfaces to record whether it reflects a light beam from a torch and whether you can see yourself in the surface or not.
Can you draw any conclusions from your results?
Surface
Dull or shiny
Light reflected from torch
I can see my face reflected
Mirror
Polished metal sheet
Sheet of perspex
Sheet of paper
Piece of polished wood
Shiny painted surface
Dull painted surface I
Unit 6F: Shiny and dull surfaces: L.O. 8, 9: N.C. 4.3c

10. Unit 6F: Shadow Investigation
How can we change the size and position of the shadow?
Plan how you are going to investigate this?
What will you change
Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

11. Unit 6F: Shadow Investigation
Shadow Investigation – support slide
How can we change the size and position of the shadow?
What happens to the size of the shadow when you move the figure nearer to the light?
What happens to the shadow when you move the figure further from the light?
Does moving the screen have the same effect?
Does moving the light make a difference? I
Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

12. Unit 6F: Shadow Investigation
Shadow Investigation – extension slide
Measure the distance between the figure and the screen and the height to the shadow.
Record the results in a table
Plot your results on a line graph of Distance between figure and screen vs. height of shadow.
Are there any patterns in the results you have?
Distance between figure and screen
Height of shadow
Unit 6F: Shadow investigation: L.O. 10, 11, 12, 13: N.C. 4.3b

13. S Concept Map How we see things Unit 6F: Summary Travels from a source
By mirrors
In a straight line
Object is seen
Light
Light enters our eyes
Reflections
Direction of a ray can be indicated by an arrow
Shiny surfaces better than dull
Direction of beam is changed
How we see things
Shadows
Formed by opaque objects
Object nearer light
Size can be
changed
Object nearer surface S
Unit 6F: Summary: L.O. 14: N.C.