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January Exams Yr9 > Physics > Flashcards

Physics Flashcards

0
Q

Some examples of luminous things

A 
Lightening
Light bulb
Sun
Torch 
Candle
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1
Q

What does luminous mean?

A

Emits light

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2
Q

How do we see non-luminous objects?

A

Light rays hit the object and are reflected from it into our eyes

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3
Q

What different types of rays are there?

A

Converging
Diverging
Parallel

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4
Q

What are some applications of converging, diverging and parallel beans?

A

Torch

Eye

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5
Q

When looking at a near object, your lens is____?

A

Fat

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6
Q

When looking at a far away object, your lens is____?

A

Thin

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7
Q

Evidence that light travels in straight lines?

A

Shadows
The pinhole camera
The light streaming through water droplets in the clouds
Light coming through branches in the forest
Light in the laser beam

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8
Q

What is the phrase for light travelling in straight lines?

A

Rectilinear propagation

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9
Q

What speed does light travel?

A

300,000,000 m/s

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10
Q

How are shadows cast?

A

When an opaque object stops light from reaching an area

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11
Q

What is an umbra shadow?

A

Sharp and completely dark

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12
Q

What is a penumbra?

A

When an extended light source is used to make a shadow

Dull and not sharp

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13
Q

What is the angle of incidence?

A

It equals the angle of reflection

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14
Q

Where are all angles measured from?

A

The Normal

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15
Q

What does incident mean?

A

Incoming

16
Q

What does reflected mean?

A

Bouncing off

17
Q

Where is the image in the plane mirror?

A

The same distance behind the mirror as the object in front of the mirror

18
Q

What are the properties on the image in the plane mirror?

A 
Same size
Upright
Laterally inverted
The same distance behind the mirror as the object in front
Virtual
19
Q

What is refraction?

A

The change in speed of light at a boundary

January Exams Yr9 (10 decks)

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