Light

Question 1

How does light travel?

Answer 1

In straight lines

Question 2

What does luminous mean?

Answer 2

An object that emits light

Question 3

What does emit mean?

Answer 3

Another word for gives out

Question 4

What does transparent mean?

Answer 4

You can see through the object - because light is not absorbed

Question 5

What does translucent mean?

Answer 5

Light scatters through the object

Question 6

What does opaque mean?

Answer 6

You cannot see through the object. The object absorbs or reflects the light.

Question 7

What is a vacuum?

Answer 7

Empty space. There are no particles.

Question 8

What is a medium?

Answer 8

A material

Question 9

How fast is light?

Answer 9

300,000,000 metres per second

Question 10

What type of wave is light?

Answer 10

Transverse wave

Question 11

Does light need a medium?

Answer 11

No

Question 12

How long does it take for light to travel from the Sun to Earth?

Answer 12

8 minutes

Question 13

Where is light absorbed?

Answer 13

In your eyes

Question 14

What does transmit mean?

Answer 14

Travels

Question 15

What does non-luminous mean?

Answer 15

An object that does not emit light

Question 16

What is a plane mirror?

Answer 16

A mirror with a flat reflective surface

Question 17

What is the imaginary line at 90 degrees to the surface of a material called?

Answer 17

The normal

Question 18

What is reflection off a smooth surface called?

Answer 18

Specular reflection

Question 19

What is reflection off a rough surface called?

Answer 19

Diffuse scattering

Question 20

State the law of reflection

Answer 20

The angle of incidence is equal the angle of reflection

Question 21

What is the ray that reflects off a mirror called

Answer 21

The reflected ray

Question 22

Reflected images are always the wrong way round - this is called? L_______ I________

Answer 22

Laterally Inverted

Question 23

What is a virtual image?

Answer 23

An image that is not formed on a screen

Question 24

If an object is 25 cm infront of a mirror, how far away will the virtual images appear behind the mirror?

Answer 24

25 cm

Question 25

What is refraction?

Answer 25

When light changes direction when it changes medium

Question 26

When does refraction occur?

Answer 26

When light travels from one transparent medium to another transparent medium (ie water to glass)

Question 27

Why does refraction occur?

Answer 27

As light changes speed when it goes from one medium to another

Question 28

What is a lens?

Answer 28

An object that focuses light to a single point

Question 29

What is a convex lens?

Answer 29

A lens that bring light together to a single point

Question 30

What is a converging?

Answer 30

A lens that spread light apart

Question 31

What does the retina do?

Answer 31

It form the image

Question 32

What does the pupil do?

Answer 32

Transmits light

Question 33

Is the cornea transparent or opaque?

Answer 33

Transparent

Question 34

What are the two types of photoreceptors?

Answer 34

Rods and cones

Question 35

What does inverted mean?

Answer 35

The image is upside down

Question 36

Where does light enter a pinhole camera?

Answer 36

The pinhole

Question 37

What happens when light hits the rods and cones?

Answer 37

Chemical reactions produce electrical signals that travels up the optic nerve to your brain

Question 38

Where is the optic nerve?

Answer 38

At the back of the eye

Question 39

What does CCD stand for?

Answer 39

charge-coupled device

Question 40

What is the eye version of the CCD in a camera?

Answer 40

The retina

Question 41

What is the camera version of the iris in the eye?

Answer 41

The apeture

Question 42

What are the primary colours?

Answer 42

Red, Blue, Green

Question 43

What are the secondary colours?

Answer 43

Cyan, Yellow, Magenta

Question 44

Why are objects a certain colour?

Answer 44

When white light hits an object, it absorbs certain colours and only reflects the colour of the object

Question 45

What do fliters do to light?

Answer 45

A red filter subtracts all colours from white light apart from red

Question 46

Why does a green object look black in red light?

Answer 46

As the red light is asborbed by the green object. The green object will only reflect green light.

Question 47

What can split white light into a spectrum of colours?

Answer 47

A prism

Question 48

State the colours in order

Answer 48

Red, Orange, Yellow, Green, Blue, Indigo, Violet ROYGBIV

Question 49

Which colour has the highest frequency?

Answer 49

Violet

Question 50

Which colour has the lowest frequency?

Answer 50

Red