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YEAR8 PHYSICS TERM1 > SEEING THINGS & REFRACTION > Flashcards

SEEING THINGS & REFRACTION Flashcards

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1
Q

What is light?

A

A way of transferring energy

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2
Q

What is luminous?

A

Object that gives out light

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3
Q

What is non-luminous?

A

Object that does not give out light

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4
Q

Why do you see things?

A

It reflects light and is luminous

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5
Q

How does light travel?

A

In a straight line

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6
Q

What is transparent?

A

See through

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7
Q

What is translucent?

A

Lets light through but is not see through

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8
Q

What is opaque?

A

Light can’t pass through

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9
Q

What are the three things light can do?

A

Can be transmitted (Light goes through a medium)
Can be reflected (Light bounces off surface)
Can be absorbed (Light does not pass through, energy converts to heat)

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10
Q

How are shadows created?

A

Light tries to go through an opaque surface but is reflected and absorbed.

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11
Q

Does light need a medium?

A

No

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12
Q

What happens when light is absorbed?

A

When absorbed stays in the object in the form of thermal energy

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13
Q

What is refraction?

A

The ‘bending’ of light when light travels from one medium to another

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14
Q

Why does refraction happen?

A

Because the speed of light is different in different mediums

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15
Q

How does light travel in a vacuum?

A

Constant speed

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16
Q

How does light travel in a denser medium?

A

Slower than the speed in a vacuum

17
Q

Why does light bend?

A

Because light is slower in a denser medium, when it speeds up, it bends back.

18
Q

Where does the change of direction happen?

A

At the boundary, or the interface between two medias

19
Q

What is real depth?

A

The real depth of something due to refraction

20
Q

What is apparent depth?

A

What the brain thinks the depth of something is (Shallower)

21
Q

Formula for refractive index

A

Refractive index = speed in vacuum / speed in medium

22
Q

Denser = Light bends _______ the normal

A

towards

23
Q

Less dense = Light bends ________ the normal

A

away from

YEAR8 PHYSICS TERM1 (15 decks)

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