# Reflection 2

In this worksheet, students will be helped to explore the way in which we see things, how light is reflected off objects and mirrors and to extend their understanding of these processes.

Key stage:  KS 2

Curriculum topic:   Light

Curriculum subtopic:   Light Travels in Straight Lines

Difficulty level:

### QUESTION 1 of 10

How do we see things? You probably know by now: light (from a luminous source like the Sun) bounces or reflects off an object in all directions; some of those light rays reach our eyes, enabling us to see the object.

With mirrors and other reflective surfaces the key thing is that, instead of the light rays scattering in all sorts of directions, they stay together:

Note that light rays are shown as lines with an arrowhead demonstrating which way the light is going; mirrors are shown as a line with shading behind it.

Remember this important rule when dealing with light rays that strike a mirror:

THE LIGHT RAY IS REFLECTED AT THE SAME ANGLE AS THE INCIDENT RAY THAT STRUCK THE MIRROR: look for the same angles arriving at and leaving the mirror.

OK, let's see whether you can use those ideas as we travel through this worksheet.....

When you look in a mirror you see a picture of you.

What is the name given to this picture?

virtual

reflection

image

What is the name given to the device used in submarines (and by spectators at golf matches) which uses two mirrors?

microscope

telescope

periscope

Here is a torch shining a ray of light on to a mirror:

Which of these possible reflections is correct?

A

B

C

Here is a picture of an eye (yours!) seeing a candle in a mirror:

There are three possible paths drawn for the INCIDENT RAY (from the candle) and the REFLECTED RAY (from the mirror) - which reflection is correct: A (in blue), B (in black) or C (in red)?

A

B

C

Some surfaces are much better at reflecting light than others - for example here is a picture of mountains reflected in a lake:

The water surface is able to do this because it has what property?

shiny

wet

liquid

If the wind starts blowing across the lake the reflection of the mountains in the lake disappears, even though the water still possesses the property you chose in question 5.

What do you think is the best explanation for this?

the surface is no longer flat so light rays bounce in all directions

the lake surface becomes dull and rough

the light rays are absorbed by the waves and are not reflected

Here is a picture from above of a car waiting to leave a narrow lane. A mirror has to be placed to help the driver see cars coming from the right.

Which of the three positions of the mirror do you think shows the correct position so that the driver is able to see cars coming from the right?

A

B

C

Here are two mirrors connected at 90o to each other with a single ray of light striking one mirror:

Which of these three possible reflections is correct?

A

B

C

Which one of the following sets of capital letters still looks the same in a mirror?

A,H,I,O

E,K,N,S

T,X,Y,Z

Magicians often use mirrors to give the illusion that something has disappeared. A 'magic box' has a mirror inside it and, as well as a lid at the top, has a front that opens. So the magician opens the lid and places a fluffy toy rabbit into the box. The lid is closed and the door at the front is opened - to the audience the box looks empty.

Which of the following arrangments of the mirror inside the box do you think allows the magician to carry out this illusion?

A

B

C

• Question 1

When you look in a mirror you see a picture of you.

What is the name given to this picture?

image
EDDIE SAYS
Well, to be strictly true it's an image! Yes, the light was reflected but the rays stayed together to form an image.
• Question 2

What is the name given to the device used in submarines (and by spectators at golf matches) which uses two mirrors?

periscope
EDDIE SAYS
Yup, a periscope has two mirrors (actually modern ones use prisms) which reflects the light twice, forming an image of something that would otherwise be invisible.
• Question 3

Here is a torch shining a ray of light on to a mirror:

Which of these possible reflections is correct?

B
EDDIE SAYS
Basically, with a mirror or other highly reflective surface, the light rays reflect from the mirror AT THE SAME ANGLE as they struck the mirror. The only one that does that is B.
• Question 4

Here is a picture of an eye (yours!) seeing a candle in a mirror:

There are three possible paths drawn for the INCIDENT RAY (from the candle) and the REFLECTED RAY (from the mirror) - which reflection is correct: A (in blue), B (in black) or C (in red)?

B
EDDIE SAYS
Using the rule that reflected ray leaves the mirror AT THE SAME ANGLE as the incident ray that struck the mirror, then B has to be the answer. The other two are not arriving/leaving at the same angle.
• Question 5

Some surfaces are much better at reflecting light than others - for example here is a picture of mountains reflected in a lake:

The water surface is able to do this because it has what property?

shiny
EDDIE SAYS
A shiny surface is one that is able to reflect light in such a way that keeps the light rays together so that they form an image; if a reflection is perfect you should be able to turn the picture upside-down and it should still look the same!
• Question 6

If the wind starts blowing across the lake the reflection of the mountains in the lake disappears, even though the water still possesses the property you chose in question 5.

What do you think is the best explanation for this?

the surface is no longer flat so light rays bounce in all directions
EDDIE SAYS
It's true that the surface becomes dull and ruffled but as a result of this the light rays that hit it no longer stay together but scatter in all sorts of directions, so an image no longer forms.
• Question 7

Here is a picture from above of a car waiting to leave a narrow lane. A mirror has to be placed to help the driver see cars coming from the right.

Which of the three positions of the mirror do you think shows the correct position so that the driver is able to see cars coming from the right?

A
EDDIE SAYS
The way to sort this out is to imagine a line from the waiting driver striking each mirror - remember that this line will leave the mirror at the same angle. Take mirror B: the light from the driver will strike the mirror at right angles and bounce back - basically the drivers see themselves. With mirror C the driver will see part of the house to their right. Only mirror A would allow the driver to see the car approaching from the right.
• Question 8

Here are two mirrors connected at 90o to each other with a single ray of light striking one mirror:

Which of these three possible reflections is correct?

B
EDDIE SAYS
Remembering that light rays reflect from a mirror at the same angle as they struck it, the rays must be reflected twice (so A is wrong) and at the same angle (so C is wrong).
• Question 9

Which one of the following sets of capital letters still looks the same in a mirror?

A,H,I,O
EDDIE SAYS
If you don't believe it go and try: take a piece of paper, copy out these sets of letters and hold them up in front of a mirror: only the A/H/I/O set will still look the same. Z in the last set won't work.
• Question 10

Magicians often use mirrors to give the illusion that something has disappeared. A 'magic box' has a mirror inside it and, as well as a lid at the top, has a front that opens. So the magician opens the lid and places a fluffy toy rabbit into the box. The lid is closed and the door at the front is opened - to the audience the box looks empty.

Which of the following arrangments of the mirror inside the box do you think allows the magician to carry out this illusion?

C
EDDIE SAYS
In fact arrangement C allows the rabbit to be placed BEHIND the mirror which, when the front door is opened, reflects the bottom of the box which, to the audience, becomes the BACK of the box which thus appears to be empty!
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