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ABO > Light Theory > Flashcards

Light Theory Flashcards

1
Q

1 m=___inches

A

39.37 inches

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2
Q

1 cm=___inches

A

0.39 inches

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3
Q

1 in=___centimeters

A

2.5 cm.

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4
Q

1 m=___decimeters

A

10 decimeters

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5
Q

1 m=___centimeters

A

100 cm

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6
Q

1 m=___millimeters

A

1000 mm

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7
Q

Frame parts and lenses are usually measured in what?

A

millimeters.

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8
Q

What is the electromagnetic wave theory?

A

Explains how light works. The sun and earth emit electromagnetic energy in varying wavelengths.

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9
Q

Where does electromagnetic energy come from?

A

The Sun and Earth .

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10
Q

Where does the energy radiate? In what motion?

A

The energy radiates in ALL directions and moves in a vibrating wave motion.

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11
Q

What is a wavelength?

A

A wavelength is the distance between pulsations and is measured in nanometers.

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12
Q

What are the two sections of the electromagnetic spectrum according to the wavelengths?

A

At one end is the shortest and the MOST energetic waves called gamma rays.
At the other end is the longest such as radio waves.

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13
Q

What is a shorter wavelength next to visible light?

A

UV rays.

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14
Q

What is a longer wavelength next to the visible light?

A

Infrared Rays.

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15
Q

What range of wavelengths that the human eye can see?

A

Approx. 380nm-750nm

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16
Q

What are the 3 types of UV light?

A

UVA, UVB,UVC.

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17
Q

How long is the wavelength of UVC?

A

200-290nm

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18
Q

What does UVC do?

A

It is absorbed by the atmosphere.

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19
Q

How long is the wavelength of UVB?

A

290-315nm

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20
Q

What does UVB do?

A

It is the source of sunburns.

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21
Q

How long is the wavelength of UVA?

A

315-380nm

22
Q

What does UVA do?

A

Ages skin.

23
Q

What types of UVs damages the eye?

A

UVA and UVB

24
Q

Where can UV exposures increase?

A

reflections off of surfaces.

25
Q

How much UV exposure does the grass and soil reflect?

A

10%

26
Q

How much UV exposure does the sand reflect?

A

15%

27
Q

How much UV exposure does the water reflect?

A

25%

28
Q

How much UV exposure does the snow reflect?

A

80%

29
Q

What is visible light?

A

A combination of all colors of the spectrum

30
Q

What happens when light enters the prism?

A

Each specific wavelength is slowed and bent to a different degree.

31
Q

What is the result of when light enters the prism?

A

This electromagnetic phenomenon is a rainbow that has been split into separate parts.

32
Q

How is the cooler blue defined in the spectrum?

A

shorter, higher energy wavelengths.

Blue rays have the tendency to focus off the retina and because of that it may cause blurry vision.

33
Q

Where are the green waves located?

A

Central portion of the spectrum.

34
Q

What do green waves convey?

A

conveys the clearest vision.

35
Q

What is the term of index of refraction refer to?

A

the relationship between the speed of light in air and the speed of light in any given medium.

36
Q

How fast is the speed of light in air?

A

186,000 miles per second.

37
Q

What happens as the density of a material increases?

A

that material has the ability to bend light.

38
Q

How is the example of the 1.49 index of refraction for a CR-39 plastic lens calculated?

A

Simply divide the speed light in CR-39 into the speed of light in air to arrive at the index of refraction of 1.49.

39
Q

What’s the formula of finding the index of refraction?

A

speed of light in air
___________________
speed of light in medium

40
Q

What does the index of refraction help determine?

A

The lens thickness.

41
Q

An index refraction as HIGH as 1.8 are noticeably…?

A

thinner, it is rarely used because glass lenses are heavy and break more easily.

42
Q

What is the index refraction for a surfacing lab standard?

A

trivex 1.53

43
Q

Describe how a ray of light would travel.

A

in a straight in a line unless interrupted by an object in its path.

44
Q

What is the term of an incoming ray strikes the surface ?

A

Angle of incidence.

45
Q

What is the term of a ray leaving a surface?

A

Angle of reflection

46
Q

When light strikes a parallel sided glass block at a perpendicular angle, its speed is …?

A

reduced but the direction is not changed. So light rays that strike a refracting surface in a perpendicular path will not be refracted.

47
Q

When light strikes a parallel sided glass at an angle other than 90 degree, the light rays will travel ….?

A

slower and will be bent. The amount of displacement depends on the thickness of the slab.

48
Q

What does the angle of incidence always equal?

A

angle of reflection.

49
Q

When can the angle of refraction can be calculated?

A

If the refractive indices of both mediums the light is traveling through are known.

50
Q

What formula is used to calculate the angle of refraction?

A

The Snell’s law.

ABO (7 decks)

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