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Year 9 Physics > Year9Light > Flashcards

Year9Light Flashcards

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1
Q

Light is a kind of …?

A

energy.

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2
Q

Light always travels in …?

A

straight lines.

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3
Q

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

A

converging.

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4
Q

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

A

diverging.

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5
Q

The fact that shadows exist is evidence that light…?

A

travels in straight lines.

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6
Q

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

A

umbra.

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7
Q

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

A

penumbra

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8
Q

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

A

a point source.

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9
Q

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

A

an extended source.

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10
Q

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

A

luminous.

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11
Q

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

A

non luminous.

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12
Q

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

A

pinhole camera

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13
Q

The image formed in a pinhole camera is…?

A

inverted.

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14
Q

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

A

real

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15
Q

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

A

virtual

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16
Q

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

A

decreases

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17
Q

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

A

plane.

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18
Q

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

A

normal

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19
Q

The light ray approaching a mirror is called the …?

A

incident ray

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20
Q

The light ray leaving a mirror is called the …?

A

reflected ray

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21
Q

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

A

angle of incidence

22
Q

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

A

angle of reflection

23
Q

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

A

90 degrees

24
Q

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

A

periscope

25
Q

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

A

45 degrees

26
Q

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

A

refraction

27
Q

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

A

towards the normal

28
Q

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

A

away from the normal

29
Q

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

A

change direction

30
Q

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

A

shallower

31
Q

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

A

Virtual

32
Q

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

A

Erect

33
Q

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?

A

They are equal

34
Q

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

A

90 degrees

35
Q

A triangular block of glass is called a…?

A

triangular prism

36
Q

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

A

base of the prism

37
Q

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

A

colours of the rainbow

38
Q

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

A

red

39
Q

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

A

violet

40
Q

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

A

primary

41
Q

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

A

secondary

42
Q

Red and blue light add to make…?

A

magenta

43
Q

Red and green light add to make…?

A

yellow

44
Q

Green and blue light add to make…?

A

cyan

45
Q

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

A

white

46
Q

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

A

absorbed

47
Q

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

A

reflected

48
Q

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

A

absorbed

49
Q

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

A

transmitted

50
Q

What colours are transmitted by a magenta filter?

A

red and blue

51
Q

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

A

black

Year 9 Physics (5 decks)

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