light Flashcards

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1
Q

luminos objects produce?

A

light

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2
Q

light is a wave whic always travels in a?

A

straight line

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3
Q

what kind of waves are light waves?

A

they are transverse waves: they have undulations

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4
Q

water waves travel by…

A

moving particles

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5
Q

do light waves need particles to travel?

A

no for example when light travels through space

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6
Q

do light waves always travel at the same speed as a vacuum

A

light waves always travel at the same speed as a vacuum but there slowed down by particles

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7
Q

the speed of light in a vacuum is

A

300000000 three hundred million metres per second

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8
Q

how long does it take for light waves to travel from the sun to the earth?

A

8.3 minutes

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9
Q

what is reflection?

A

reflection is when a wave hits the surface

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10
Q

rough surfaces look dull because…

A

because the light is reflected in lots of diffrent directions

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11
Q

angle of incidence(i) =

A

=angle of reflection

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12
Q

when light goes from a LESS DENSE medium to a MORE DENSE MEDIUM

A

light bends towards the normal (e.g air to glass)

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13
Q

When light hits glass at an angle…

A

it slows down and bends

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14
Q

what does a lens do?

A

a lens refracts(bends) light

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15
Q

a convex lens bulges outwards and makes rays of light…

A

converge (move together)

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16
Q
A
17
Q
A