What would life be like without colour?
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What would life be like without colour?. Dull. 10.4 Colour!. How do these colours make you feel?. Colour moods. Different colours can affect how we feel: RED can make people angry ORANGE is a happy colour YELLOW is a cheerful colour GREEN is calming BLUE is a cool but restful colour

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What would life be like without colour?

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What would life be like without colour

What would life be like without colour?


What would life be like without colour

Dull.


What would life be like without colour

10.4 Colour!

How do these colours make you feel?

Colour moods

  • Different colours can affect how we feel:

  • RED can make people angry

  • ORANGE is a happy colour

  • YELLOW is a cheerful colour

  • GREEN is calming

  • BLUE is a cool but restful colour

  • Do you agree? Write a list of colours at the back of your books and next to them, write what they make you feel.


What would life be like without colour

Learning Outcomes

  • Today you will:

  • Draw a diagram to show the different colours that make up white light

  • Plan and carry out a presentation about how the different theories of what makes up white light


What would life be like without colour

Memorise these. You have 30 seconds. GO!

  • Today you will:

  • Draw a diagram to show the different colours that make up white light

  • Plan and carry out a presentation about how the different theories of what makes up white light


What would life be like without colour

What was Learning Outcome 2?


What would life be like without colour

What was Learning Outcome 2?

2. Plan and carry out a presentation about how the different theories of what makes up white light


What would life be like without colour

Lesson Objective

To be able to explain how white light can be dispersed into 7 different colours, according to their wavelengths.


What would life be like without colour

Let’s watch a demo.

What colour is the light that we see ‘come out’ of a light bulb?

What colours do we see in a rainbow?


What would life be like without colour

10.4 Dispersing light

Dispersion

Breaking up white light

You’ve just seen how a prism can break up white light into 7 colours.

This breaking up of white light is called dispersion. The prism disperses the light.

KEY WORD ALERT!


What would life be like without colour

10.4 Dispersing light

Dispersion

Colours

This breaking up of white light is called dispersion. The prism disperses the light.

When white light is broken up like this the 7 colours are always in the same order.

top

RED

ORANGE

YELLOW

GREEN

BLUE

INDIGO

VIOLET

bottom


What would life be like without colour

10.4 Dispersing light

ROY GBIV

Colours

How can you remember the order?

There’s the famous spy:

ROYGBIV

Or a defeated British king:

Richard Of York Gained Battle In Vain

See if you can think of your own.


What would life be like without colour

10.4 Dispersing light

Rainbows

Colours

You can see the order in this rainbow.


What would life be like without colour

10.4 Dispersing light

Wavelengths

Why does light disperse like this?

Remember that light is a wave.

wavelength

The size of a wave is measured from one peak to the next and is called its wavelength.

KEY WORD ALERT!


What would life be like without colour

10.4 Dispersing light

Wavelength and Dispersion

Why does light disperse like this?

White light is made up of all the colours of the rainbow.

Each colour has its own wavelength.

Red has the longest and violet has the shortest wavelength.

CAN SOMEONE PLEASE SHOW ME WHERE I WOULD MEASURE THE WAVELENGTH ON THESE DIAGRAMS?


What would life be like without colour

10.4 Dispersing light

Wavelength and Colour

Why does light disperse like this?

When light enters a glass prism it slows down.

But the shorter wavelengths slow down most and so bend more sharply.

Blue is a short wavelength.

Red is the longest one.


What would life be like without colour

10.4 Dispersing light

Blue Bends Best

Why does light disperse like this?

As each wavelength, or colour, slows down at a different rate it therefore has a different angle of refraction to the rest.

This means the different colours spread out.

REMEMBER! Blue bends best.

KEY PHRASE ALERT!


What would life be like without colour

10.4 Dispersing light

Spectrum of Colour

Why does light disperse like this?

The shape of the prism means they spread out even more on leaving the prism.

You may see a small spectrum with a rectangular glass block but the colours do not spread out as much.

KEY WORD ALERT!


What would life be like without colour

IN YOUR BOOK, COPY AND COMPLETE THE DIAGRAM ABOVE TO SHOW WHITE LIGHT DISPERSING INTO IT’S 7 COLOURS. COLOUR IN THE SPECTRUM ON THE RIGHT TO SHOW THE SPECTRUM OF COLOUR. REMEMBER: ROYGBIV!


What would life be like without colour

SWAP BOOKS, LOOK AT THE ANSWER ABOVE, AND GIVE YOUR PARTNER TWO STARS AND A WISH.

STARS = WHAT WENT WELL

WISH = WHAT THEY COULD IMPROVE FOR NEXT TIME


What would life be like without colour

Let’s watch a demo.

So we know how to split white light into it’s seven colours.

Can we turn these colours back into white light?

How?


What would life be like without colour

10.4 Dispersing light

Making white light again

Recombining colours

When a second prism is added ‘upside down’ the dispersion of the second prism is in the opposite direction to the original dispersion.

White light is formed again.


What would life be like without colour

10.4 Dispersing light

Making white light again

Recombining colours

Look carefully. The two triangular prisms form a parallel-sided glass block.

We didn’t see dispersion when we passed a ray of light through a rectangular glass block.


What would life be like without colour

10.4 Dispersing light

Making white light again

Spinning disc

The image stays on the retina at the back of the eye for about 1/10 of a second.

When the disc spins very fast all the colours of the rainbow appear on the retina together.

The colours all combine to form white light.


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