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Optics > Optics > Flashcards

Optics Flashcards

1
Q

How does light travel

A

In straight lines

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2
Q

What is the speed of light

A

3x10 to the power of 8

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3
Q

What does a convex lens correct

A

Longs sightedness

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4
Q

What does a concave lens corrects

A

Short sightedness

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5
Q

What is the order of the white light spectrum

A

Red
Orange
Yellow
Green
Blue
Indigo
Violet

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6
Q

What is the relationship between the angle of incidence and the angle of reflection

A

The angle of incidence = the angle of reflection

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7
Q

Does light travel faster or slower in a glass block

A

Slower

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8
Q

What does light do when it enters a glass block

A

Refracts

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9
Q

What way does the light refract as it enters the glass block

A

Towards

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10
Q

What can a gamma ray be used for

A

Sterilising surgical instruments

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11
Q

What can a uv ray be used for

A

Treating vitamin d deficiency

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12
Q

What effect does a convex lens has on light

A

A convex lens focuses a light inwards to a focal point

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13
Q

What effects does a concave lens have on light

A

A concave lens refracts the light out the way

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14
Q

What is the cornea

A

The cornea is a clear protective layer at the front of the eye that also refracts light

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15
Q

What is the iris

A

The iris is a coloured muscle that alters the size of the pupils which also controls how much light enters the eye

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16
Q

What does the lens do

A

The lens focuses light on the retina

17
Q

What is the retina

A

The retina is a light sensitive layer that converts light into electrical impulses

18
Q

What is the pupil

A

A hole at the front of your eye that allows light to enter the eye

19
Q

What is the optic nerve

A

The optic nerve carries electrical messages form the eye to the brain

20
Q

What is short sightedness

A

Short sightedness mean you have trouble seeing things from far away

21
Q

What is long sightedness

A

Long sightedness is that you have trouble seeing things close up

22
Q

Do radio waves have the shortest or longest wavelength

A

Longest wavelength

23
Q

Does a gamma ray have the shortest or longest wavelength

A

Shortest wavelength

24
Q

Does a gamma ray have the highest or lowest frequency?

A

Highest frequency

25
Q

Does a radio wave have the highest or lowest frequency? 

A

Lowest frequency 

26
Q

What can a radio wave be used for? 

A

To communicate 

27
Q

What can a microwave be used for? 

A

Radar or to heat food

28
Q

What can infrared be used for?

A

Thermometer

29
Q

What can a visible wave be used for? 

A

To let us see

30
Q

Where can a UV light be used for

A

In sunbeds

31
Q

What can you use an x-ray for? 

A

To see bones 

32
Q

What can a gamma be used for? 

A

Treating cancer

Optics (1 decks)

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