Light

Light

Learning outcomes

Luminous objects create their own light.

Non-luminous objects can only be seen when light is shone onto them.

By the end of the lesson I will be able to:

Without light we cannot see.

Where is the light in the classroom coming from?

Can you think of any other sources of light?

3

Group quiz: for each object say if it is luminous or not

Increasing challenge

Say whether objects are luminous or not

Describe how light travels

Appreciate the speed of light and what a light year is

4/5

5/6

Copy and complete adding the path of the light

What is light?

Timed pair share

To see something non-luminous the light has to reflect from it and into your eye

Talk to you partner for 30 seconds about what you think light is and then swap roles

Green difficulty

How do we see the moon?

How do we see our friends?

Red Challenge

How does the periscope see the boat? (Clue, the red lines are mirrors)

Light from the sun hits the pear and is reflected.

Some of the reflected light goes into your eye and you see the pear.

How fast is light?

To us light is so fast that it appears to travel instantly.

The light from our sun takes 4.2 years to reach the closest star (Proxima Centauri)

Light travels very, very fast.

Space is very big though and light takes time to travel across it.

300,000,000 metres every second!

Proxima Centauri is 4.2 light years away.

It takes light eight minutes to travel from the sun to the earth.

A light year is a very big distance. It is how far light travels in one year.

The nearest galaxy to us (Andromeda) is 2,500,000 light years away.

The light that we currently see from that galaxy began its journey when our human ancestors looked like this:

Tasks - complete 2

Beat the king

Write a table containing 5 luminous and 5 non-luminous objects.

Draw a picture to explain how you see your reflection in a mirror.

Write 5 true or false questions about light and test someone on your table.

Write a poem about light.

Write a short story/diary entry about what it feels like to be a wave of light.

Asking questions about anything from today's lesson.

If light travels 300,000,000 metres in a second how many metres are in one light year?