1. Sort the materials into three piles
Why have you sorted them this way?

2. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works

3. Optical Properties of Materials
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Optical Properties of Materials
Transparent material lets almost all the light pass through.
Translucent material only allows some of the light through.
Opaque material does not allow light to pass through.

5. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works

6. Light travels as a transverse wave.
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Light
Light travels as a transverse wave.
Amplitude
Crest
Trough
Unlike sound, light waves do not need particles to travel

7. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Light travels at a speed of
m/s
faster than anything else in the Universe.
Explain why we see lightning before we hear thunder.
EXTENSION
What is a light year?
Why do we say astronomers are studying the past?

8. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works

9. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Why do shadows form?

10. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Light rays cannot bend around or travel through opaque objects
Shadows will be longer if the object is closer to the light source

12. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
YOUR TASK
Use the available equipment to build a pinhole camera
Draw a ray diagram in your notes to show how the image is formed

13. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
The Pinhole Camera

14. - how a pinhole camera works
Learning Objectives
By the end of this lesson you should…
Understand the terms transparent, translucent and opaque
Be able to describe how light travels
Be able to construct ray diagrams to show:
- how shadows form
- how a pinhole camera works
Light or sound waves?
Travel faster than anything else in the Universe
Travel faster in solids
Are carried by vibrating particles
Transfer energy from one place to another
Cannot bend around corners