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Physics Y8 > Light > Flashcards

Light Flashcards

1
Q

What is the speed of light in air?

A

300,000,000 m/s

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2
Q

Can light pass through a vacuum?

A

Yes - Sound cannot

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3
Q

What is the name of the wave light travels in?

A

Transverse Wave

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4
Q

Visible light is one part of the WHAT?

A

Electromagnetic Spectrum of Radiation

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5
Q

Visible light is the section of the WHAT spectrum that our eyes can detect?

A

EM spectrum

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6
Q

How long does light take to reach Earth?

A

8 minutes

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7
Q

Name of an object that emits light

A

Luminous object

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8
Q

What is a light ray?

A

A straight line with an arrow to show the direction of light

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9
Q

When light hits an object, what can happen?

A

It can change direction, pass through to object or be absorbed

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10
Q

When light hits an irregular surface and the light scatters, what is it called?

A

Diffuse Reflection

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11
Q

When lights reflects off a flat surface, the light reflects at a precise angle. What is this called?

A

Precise Reflection

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12
Q

What is the angle of incidence equal to?

A

The angle of reflection

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13
Q

Where are angles always measured from?

A

The normal

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14
Q

What is refraction?

A

A change of speed and direction of a wave when it passes from one medium to another

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15
Q

What happens in refraction?

A

The wave travels fast, then slows when it enters another medium, then speeds up again when it leaves it

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16
Q

When light travels from air to glass, what happens?

A

It bends toward the normal

17
Q

When light travels from glass to air, what happens?

A

It bends away from the normal

18
Q

What is dispersion of light?

A

The splitting of light into a spectrum of colours

19
Q

What is recombination of light?

A

The combining of a spectrum of colours into white light

20
Q

What is a converging lens?

A

A lens that brings a series of parallel light rays together at a point called the focus.

21
Q

What is a diverging lens?

A

A lens that causes a series of parallel light rays to spread out as if they came from a single point known as the focus.

22
Q

What is the lens called in the eye?

A

The cornea

23
Q

What is the iris?

A

The coloured part of the eye. It has a hole in the middle called to pupil. The iris can change size to control the amount of light entering the eye.

24
Q

What light do we see?

A

Reflected light.

25
Q

What colours would a green leaf absorb and what would it reflect?

A

Absorb - Red, Orange, Yellow, Blue, Indigo, Violet
Reflect - Green

26
Q

Red + Green =

A

Yellow

27
Q

Red + Blue =

A

Magenta

28
Q

Blue + Green =

A

Cyan

Physics Y8 (1 decks)

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