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Year 8 Science > Light > Flashcards

Light Flashcards

1
Q

What does Transparent mean?

A

Transparent materials transmit light which means you can see through them

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2
Q

What does translucent mean?

A

Translucent materials transmit some light but not all which means you cannot see clearly through them.

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3
Q

What does Opaque mean?

A

Opaque materials absorb light which means you cannot see through them and a shadow is formed behind them.

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4
Q

What is refraction?

A

Refraction is the change in angle of light when it passes from one transparent medium to another. This happens because it changes speed.

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5
Q

What is the job of the lens?

A

To focus light

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6
Q

What is the job of the cornea?

A

To protect the eye

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7
Q

What is the job of the iris?

A

It changes size to contract/dilate the pupil

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8
Q

What is the job of the pupil?

A

To allow light to pass through.
The Gap the light passes through

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9
Q

What is the job of the retina?

A

To collect light

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10
Q

What is the job of the optic nerve?

A

To send an electrical signal to the brain
Sends an electrical signal to the brain

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11
Q

What do you call an object which produces light?
And its antonym

A

Luminous
Non-luminous

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12
Q

What happens to light when it hits an object?

A

It can be either absorbed, reflected or transmitted

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13
Q

What is the speed of light?

A

300,000,000 m/s
300,000 km/s

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14
Q

What are the primary colours?

A

Red, Green & Blue

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15
Q

What are the secondary colours?

A

Magenta, Cyan & Yellow

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16
Q

Which colour absorbs the most light?

A

Black

17
Q

Which colour reflects the most light?

A

White

18
Q

What is white light made of?

A

All the colours

19
Q

What is the law of reflection?

A

Angle of incidence = Angle of reflection

20
Q

There is a Yellow Filter. Which colour light can pass through?

A

Red and Green

21
Q

There is a Magenta filter. Which colour light can pass through?

A

Red and Blue

22
Q

There is a Cyan filter. Which colour light can pass through?

A

Blue and Green

23
Q

There is a Cyan filter. There is Red light. What colour will there be?

A

Black

24
Q

What does amplitude mean?

A

Amplitude is the height of a wave

25
Q

What does Frequency mean?

A

Frequency is the number of waves that pass a point in a second

26
Q

What does Wavelength mean?

A

The wavelength is the length of a wave.

27
Q

What type of wave is light?

A

Transverse

Year 8 Science (5 decks)

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