Year9Light

Question 1

Light is a kind of …?

Answer 1

energy.

Question 2

Light always travels in …?

Answer 2

straight lines.

Question 3

A beam of light in which the light rays are getting closer together as they travel along is called…?

Answer 3

converging.

Question 4

A beam of light in which the light rays are getting farther apart as they travel along is called…?

Answer 4

diverging.

Question 5

The fact that shadows exist is evidence that light…?

Answer 5

travels in straight lines.

Question 6

The area of total darkness in a shadow is called the…?

Answer 6

umbra.

Question 7

The area of partial darkness in a shadow is called the…?

Answer 7

penumbra

Question 8

A shadow which is entirely umbra is formed when the light source is …?

Answer 8

a point source.

Question 9

A shadow which is part umbra and part penumbra is formed when the light source is …?

Answer 9

an extended source.

Question 10

An object which creates and gives out its own light is called…?

Answer 10

luminous.

Question 11

An object which does not create and give out its own light is called…?

Answer 11

non luminous.

Question 12

A light-tight box with a small pinhole in it can be used as a…?

Answer 12

pinhole camera

Question 13

The image formed in a pinhole camera is…?

Answer 13

inverted.

Question 14

An image that can be projected on to a screen is called…?

Answer 14

real

Question 15

An image that cannot be projected on to a screen is called…?

Answer 15

virtual

Question 16

As a pinhole camera moves away from the object the image size …?

Answer 16

decreases

Question 17

A mirror that is not curved but flat is called…?

Answer 17

plane.

Question 18

The imaginary line at right angles to a mirror is called the …?

Answer 18

normal

Question 19

The light ray approaching a mirror is called the …?

Answer 19

incident ray

Question 20

The light ray leaving a mirror is called the …?

Answer 20

reflected ray

Question 21

The angle between the incident ray and the normal is called the…?

Answer 21

angle of incidence

Question 22

The angle between the reflected ray and the normal is called the…?

Answer 22

angle of reflection

Question 23

Any light ray that meets a mirror at an angle of incidence of 45 degrees will be turned through…?

Answer 23

90 degrees

Question 24

A device that uses two mirrors to enable you to see over objects is called a …?

Answer 24

periscope

Question 25

The mirrors in a periscope are tilted at an angle of ...?

Answer 25

45 degrees

Question 26

The change in direction of light when it enters a new material is called...?

Answer 26

refraction

Question 27

When light travels from a less dense to a more dense material it bends...?

Answer 27

towards the normal

Question 28

When light travels from a more dense to a less dense material it bends...?

Answer 28

away from the normal

Question 29

If light enters a new material while travelling along the normal it does not...?

Answer 29

change direction

Question 30

The bending of light as it travels from water into air makes the water appear to be

Answer 30

shallower

Question 31

Is the image formed by a plane mirror real or virtual?

Answer 31

Virtual

Question 32

Is the image formed by a plane mirror erect or upside-down?

Answer 32

Erect

Question 33

How does the distance from the image formed by a plane mirror to the mirror itself compare with the distance between the mirror and the object?

Answer 33

They are equal

Question 34

What is the angle between a plane mirror and a line joining the object and the image?

Answer 34

90 degrees

Question 35

A triangular block of glass is called a...?

Answer 35

triangular prism

Question 36

When light of one pure colour enters and leaves a triangular prism it bends towards the...

Answer 36

base of the prism

Question 37

When white light passes through a triangular prism it bends towards the base and it splits into all the ...?

Answer 37

colours of the rainbow

Question 38

The colour that bends least as it passes through a prism is ...?

Answer 38

red

Question 39

The colour that bends most as it passes through a prism is ...?

Answer 39

violet

Question 40

Red green and blue are the ...?... colours of light

Answer 40

primary

Question 41

cyan magenta and yellow are the ...?... colours of light

Answer 41

secondary

Question 42

Red and blue light add to make...?

Answer 42

magenta

Question 43

Red and green light add to make...?

Answer 43

yellow

Question 44

Green and blue light add to make...?

Answer 44

cyan

Question 45

When red green and blue light is mixed we get ...?... Light

Answer 45

white

Question 46

When white light hits red card all colours of light except red are...?

Answer 46

absorbed

Question 47

When white light hits red card the red light in the white light is ...?

Answer 47

reflected

Question 48

When white light hits a blue filter all colours of light except blue are...

Answer 48

absorbed

Question 49

When white light hits a blue filter the blue light in the white light is...?

Answer 49

transmitted

Question 50

What colours are transmitted by a magenta filter?

Answer 50

red and blue

Question 51

What colour does a yellow tee-shirt look when lit by pure blue light?

Answer 51

black