Topic 10 Visible Light Flashcards

1
Q

The properties of light are: (list three properties)

A

Light is emitted by luminous objects
Light travels in straight lines
Light travels much faster than sound

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2
Q

The change in direction of a wave passing from one medium to another caused by it’s change in speed.

A

Refraction

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3
Q

Spreading of something over an area.

A

Dispersion

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4
Q

Light travels to the material and is unable to travel any further.

A

Absorbed light

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5
Q

Light that has changed direction, but continues to travel in the original material.

A

Reflected light

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6
Q

Length of one wave pattern.

A

Wavelength

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7
Q

Number of waves that move past a certain point in one second

A

Frequency

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8
Q

Materials that allow all light to pass through.

A

Transparent

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9
Q

Let light through but scatter it.

A

Translucent

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10
Q

Materials that do not let light through (they absorb or reflect the light).

A

Opaque

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11
Q

To send (as in sound or light). It also means light passing through an object.

A

Transmit

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12
Q

The order of colours in the visible spectrum:

A

Red, Orange, Yellow, Green, Blue, Indigo, Violet

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13
Q

Light ray which hits the surface.

A

Incident ray

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14
Q

Ray which is reflected from the surface.

A

Reflected ray

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15
Q

Imaginary line drawn perpendicular to the surface.

A

Normal line

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16
Q

Angle between the incident ray and normal line.

A

Angle of incidence

17
Q

The angle between the reflected ray and normal line

A

Angle of reflection

18
Q

The colour of light which is refracted the least by a triangular prism.

19
Q

The colour of light which is refracted the most by a triangular prism.

20
Q

A lens which has two sides that curve inwards.

21
Q

A lens which has one side that curves outward.

22
Q

Shadows: an object far from a light source makes a …………………….. shadow.

23
Q

Shadows: an object close to a light source makes a …………………. shadow.

24
Q

The law of reflection

A

The angle of incidence is equal to the angle of reflection.

25
At a cricket match we see the bat hit the ball before we hear the 'crack' because...
light travels faster than sound.
26
If light moves from air to glass, the light is refracted ............................... the normal.
towards
27
If light moves from water to air, the light is refracted ......................... the normal
away from
28
The part of the eye that transmits information from the retina to the brain.
Optic nerve
29
The hole in the centre of the iris that controls how much light enters the eye.
pupil
30
In bright light the pupil ........................ in size.
decreases
31
In dim light the pupil ............................. in size.
increases
32
The protective front covering of the eye.
cornea
33
The sensory layer at the back of the eye.
retina
34
When light hits a rough surface, the light is ..............................
scattered
35
True or False: A black object appears black because it reflects black light into your eye.
False
36
True or False: A white object appears white because it reflects the entire visible spectrum into your eye.
True
37
True or False: A red object appears red because it absorbs all the colours of light, except red, which it reflects into your eye.
True