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Optics > Chapter 1: Light > Flashcards

Chapter 1: Light Flashcards

(54 cards)

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1
Q

Medium

A

any physical substance which energy can be transferred

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2
Q

Radiation

A

A method of energy transfer that does not require a medium

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3
Q

Electromagnetic wave:

A

A wave that had electric and magnetic parts, does not require a medium and travels at the speed of light

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4
Q

Visible light

A

electromagnetic waves that the human eye can detect (ROYGBIV)

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5
Q

Electromagnetic spectrum

A

All the electromagnetic wavelengths paced in order of increasing energy

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6
Q

What is the spruce of energy

A

The sun

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7
Q

In a vacuum light travels at a speed of

A

3.0x 10 to the power of 8

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8
Q

What do luminous objects produce?

A

Their own light

Example: The sun

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9
Q

What is light ?

A

A form of energy

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10
Q

What are the characteristics of light?

A

Light can travel through a vacuum
In a vaccuum it travels at a speed of 3.0x10 to the power of 8 m/s
Light shows both particle- like and wave- like properties

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11
Q

In the particle theory it is believed that light can be in small packets called..

A

Photons

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12
Q

Who was the english scientist that predicted that electricity and magnetism couple together?

A

J.C Maxwell predicted

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13
Q

What year did J.C Maxwell predict electricity and magnetism work together?

A

1864

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14
Q

What are Non- luminous sources ?

A

Non- luminous sources do not produce their own light but can only reflect light

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15
Q

What are the 6 ways light can be produced?

A

Incandesecene, Phosphorscene, Fluorescence,Chemiluminescence, Bioluminescence and Triboluminescence

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16
Q

What is electric discharge?

A

The production of light by passing an electric current through a gas

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17
Q

What is incandescence?

A

The production of light as a result of high temperatures.

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18
Q

What is Phosphorescence?

A

The process of producing low energy light (glow-in-the-dark) by phosphors which absorb UV light and gradually emit it over a long period of time

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19
Q

What is Fluorescence?

A

Happens when an object absorbs ultraviolet light and immediately releases the energy as a visible light

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20
Q

What is Chemiluminescence?

A

The production of light as a result of a chemical reaction with little heat or no heat produced

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21
Q

What is Bioluminescence?

A

The production of light in living organisms as a chemical reaction

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22
Q

What is Triboluminescence?

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A

The production of light as the result of scratching or crushing certain crystals

23
Q

What are LED’s?

Study These Flashcards
A

Electric devices that allow electric current flowing in a semi-conductor (in one direction only).

24
Q

What does a laser produce?

Study These Flashcards
A

Electromagnetic waves of exactly the same level.

Also it’s very pure colour

25
What makes lasers light very intense and concentrated in one narrow beam?
All lasers waves are produced to travel in the same direction and in the exact unison
26
What is the order of the electromagnetic spectrum?
Radio waves> Microwaves> infrared light> visible light> ultraviolet light> Xrays> Gamma Rays (Rio makes interesting visual upper X-rays Graduate)
27
White light is formed by
The presence of all visible colours
28
what is black light?
The abs scene of all visible colours
29
What does ROYGBIV stand for?
``` Red Orange Yellow Green Blue Indigo Violet ```
30
What are the 3 degrees of clarity
Transparent, Translucent and Opaque
31
What is a plane mirror?
A flat mirror
32
What is the normal?
is the line drawn perpendicular (90 degrees) to a surface
33
What is the angle of incidence?
The angle measured between the incident ray and the normal
34
What is an incident ray
The incoming ray that strikes a surface
35
What is a reflected ray?
The ray that bounces off a surface
36
What is an angle of reflection?
The angle measured between the reflected ray and the normal
37
What is a mirror
Any polished surface that reflects a mirror
38
What are the laws of reflection off a plane mirror?
1. The angle of incidence equals the angle of reflection | 2. The incident ray, the reflected ray and the normal all lie on the same place
39
What is specular reflection?
The reflection of light off a smooth surface. The image looks identical to the object
40
What is Diffuse reflection?
Reflection off an irregular surface. | The reflected rays are scattered in many directions
41
What is Dyslexia?
People with dyslexia have difficulty reading print. They complain about too much glare off white paper
42
What is a virtual image?
an image formed by the light coming from an apparent
43
What is a real image?
An images formed by light that is actually arriving at or coming from the actual image location
44
What are the properties of an image in a mirror?
Size Attitude Location Type
45
What are the rules to drawing a line to | locate an image
1. The distance from the object to the mirror is exactly the same as the distance from the mirror to the images 2. The object- image is perpendicular to the mirror surface
46
Why is a concave mirror?
A mirror whose centre bulges away | from you
47
A convex (diverging) mirror is
a mirror whole centre bulges towards you
48
The centre of Curvature (C) Is..
the centre of the sphere that produced the curve
49
What is the principal axis?
The line through the centre of curvature to the midpoint of the the mirror
50
What is the vertex?
the point where the principal axis meets the mirror
51
What is a converging ray?
Reflected rays that come together
52
What is the focus?
The point where converging rays come together
53
What are diverging rays
Reflected rays that spread apart
54
What is a diverging mirror ?
Reflects rays that always spread apart

Optics (2 decks)

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