Light and Refraction Topic Review

Light and Refraction Topic Review

By J Furmston-Evans

Review what refraction is...

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Describe what happens as light enters and leaves an object...

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Review how the colours of light work...​

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(If it works out, we will do the coin thing too)

In this lesson we will...

But first!

Get your Quiz brain on!

Multiple Choice

Sound

Sound waves are made when an object...

• moves

• expands

• vibrates

• bends

Multiple Choice

Sound

Sound can travel through solids, liquids and gases.

In which of these does sound travel the fastest?

• Solids

• Liquids

• Gases

• All the same speed

This means that they don't have to move as far to pass the vibration along

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i.e. sound wave is passed on quicker​

Whoosh!

​In solids, particles are near one another

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Multiple Choice

Forces

Forces can do many things to a moving tennis ball.

Which one of these can it not do?

• Change its shape

• Change its speed

• Change its mass

• Change its direction

Multiple Choice

Forces

A car has 4 forces acting on it,

they all cancel each other out.

What will happen?

• Speed up

• Stay at same speed

• Slow down

• Stop

Multiple Choice

Light

Which of these best describes refraction?

• When light bounces off an object

• When light scatters off an object

• The way light curves as it moves through an object

• The angle of bend when light enters or leaves an object

Multiple Choice

Light

Red, Blue and Green are the...

• Primary Colours of Light

• Primary Colours of Reflected Light

• The Secondary Colours of Light

• The Secondary Colours of Reflected Light

Multiple Choice

If I look at a Blue lego brick under red light, what colour will it appear to be?

• - Blue -

  because that's what it is

• - Red -

  because there is only red light to reflect

• - Black -

  because the blue brick cannot reflect other primary colours

• - Magenta - because it's a mix of blue and red

Multiple Choice

Grass looks green because it reflects and scatters green light. What happens to the other colours?

• Absorbed

• Scattered

• Refreacted

• Filtered

Multiple Choice

Looking through a purple chocolate wrapper, the world looks purple.

What happens to other colours of light?

• Absorbed

• Scattered

• Refracted

• Filtered

Learning Time!

Yay!

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​Duplicate this text as many times as you would like.

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Open Ended

A car is about to leave the road and head through some mud.

It hits the mud straight-on, what happens?

Open Ended

A car is about to leave the road and head through some mud.

It hits the mud at an angle, what happens?

The wheels on the right hand side hit the mud

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The mud slows these wheels down​

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This forces the car to turn​

What will happen when the car leaves the mud?

​Hitting the mud at an angle

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Once bent, the light will travel in a straight line again

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Light​ will return to the same angle when it leaves

Pretty cool, eh!

This explains why...

Multiple Choice

This diagram shows how the light is behaving

BUT ... which position will Leah think the fish is in?

• A

• B

• C

• D

The fish and the coin in the water...

Our eyes do not 'know' that refraction has taken place

They only perceive things from the angle that light comes at them...

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​This means, your brain estimates a position based on that angle​...

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If light has been refracted​, the angle MUST be wrong

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