Light

Question 1

What is light?

Answer 1

Light is a transfer of energy from one store of energy to another

Like when you move food from the cupboard to your mouth!
So true bruv!!

Question 2

What form is the energy of light transmitted in?

Answer 2

The form of waves

Question 3

Does light need a medium to travel through?

Eg. Water, air, brick

Answer 3

Nope! And the waves can still travel very fast over very long distances!

Question 4

What direction does light travel?

Answer 4

IN A STRAIGHT LINE
not a wonky one
not a zigzag one
A STRAIGHT ONE

Question 5

When does light stop?

Answer 5

Light travels through a medium until it hits another object

Question 6

What are light rays?

Answer 6

Light rays are an imaginary line that shows the direction in which light is travelling

Question 7

What is darkness?

Answer 7

An absence of light
no light at tall
None
Why are you still reading this

Question 8

What does luminous mean?

Answer 8

Something that emits light

Like a lightbulb

Question 9

What are the rules of drawing Ray diagrams?

Answer 9

• Use a ruler
• Use a pencil
• Use an arrow to show direction

Question 10

Why can you not see far away things really really well?

Answer 10

Because light rays spread out so less light reaches your eye

Question 11

Definition of transmitted?

Answer 11

Light hits and passes through

Question 12

Definition of absorbed?

Answer 12

Light hits and stops

Question 13

Definition of reflected/scattered?

Answer 13

Light hits and bounces off

Question 14

How do you see an object?

Answer 14

You see a bottle when the light bounces off the bottle and into your eye

Question 15

Definition of transparent?

Answer 15

Allow light through without scattering

Question 16

Definition of opaque?

Answer 16

Doesn’t allow any light through

Question 17

Definition of translucent?

Answer 17

Scatters light as it passed through

Question 18

Definition of reflective?

Answer 18

A material that light bounces off

Question 19

What is the normal?

Answer 19

A line at 90 degrees to a surface, drawn at the point where light hits the surface

Question 20

Angel of incidence is…….

Answer 20

20 degrees from the normal, the angle between the normal and where the light is coming from

Question 21

Angle of reflection is…….

Answer 21

The angle between the normal and the reflected ray

Question 22

What colours is yellow made of

Answer 22

FOOLED YA BRUV!!
Yellow is not made up of any other colours. That doesn’t seem right to be honest but that is what the science book bible says…..
ENLIGHTENMENT!

Question 23

The angle of reflection is …………….. to the angle of incidence

Answer 23

equal!!

Question 24

What is depth perception?

Answer 24

When you see something in water where it isn’t because your brain thinks light travels in a straight line. Your brain is right, but light still changes direction when it enters something else.
Science beat ya brain bruv!!

Question 25

Refraction is.......

Answer 25

When the angle of incidence is smaller than the critical angle.

Question 26

What colours can the sensors in our eyes detect?

Answer 26

Red Green Blue

Question 27

Red + Blue =

Answer 27

Magenta

Question 28

Blue + Green =

Answer 28

Cyan

Question 29

What happens if you shine yellow light through a prism?

Answer 29

The yellow light would stay the same and just refract

Question 30

Red + Green =

Answer 30

Yellow

Question 31

Mixing two types of light will always result in a

Answer 31

Brighter light!

Question 32

What is the order of the rainbow?

Answer 32

Red Orange Yellow Green Blue Indigo Violet *Richard of York gave battle in vain*

Question 33

Red + Green + Blue =

Answer 33

WHITE

Question 34

White light is made of

Answer 34

all the colours in the spectrum :)

Question 35

What are the parts of your eye?

Answer 35

The cornea, the lens, the iris and the retina.

Question 36

What is a cornea?

Answer 36

A transparent window with a convex shape. this is how your eyes focus.

Question 37

What is a lens?

Answer 37

It changes shape behind the cornea to focus light from objects at varying distances

Question 38

What is an iris?

Answer 38

The coloured part of your eye that controls how much light enters it.

Question 39

What is a retina?

Answer 39

It is where images are formed (upside down). The cells in the retina are photo sensitive.

Question 40

Which 2 angles are the same

Answer 40

The angle of incidence and the angle of reflection. They are both 20 degrees