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Science-Grade 10 > Rays > Flashcards

Rays Flashcards

(59 cards)

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1
Q

Light is…

A

A straight line

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2
Q

A luminous object such as a candle

A

radiates light in all directions

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3
Q

A luminous object such as a flashlight

A

radiates light in ONE directions

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4
Q

What is a light ray

A

A line and arrow representing the direction and straight-line path of light.

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5
Q

What does a ray diagram show?

A

A ray diagram shows the path of a light ray when it hits an object

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6
Q

What is Rectilinear propagation

A

a light that travels in a straight line

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7
Q

What is an electromagnetic spectrum?

A

A diagram that shows the range(spectrum) of electromagnetic waves in order of wavelength or frequency.

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8
Q

Which colour has the longest wavelength of visible light

A

Red

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9
Q

Which colour has the shortest wavelength

A

Violet

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10
Q

Order of colours

A

ROYGBIV

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11
Q

As wavelength increases…

A

energy decreases

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12
Q

As wavelength decreases

A

energy increases

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13
Q

Light can be…

A

Luminous and non-luminos

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14
Q

What does luminous mean?

A

it gives off its own light

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15
Q

what does non-luminous mean?

A

it does not give off its own light, it gives off reflected light

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16
Q

What does Incandescence mean? and give an example

A

Light is emitted because of the high temperature of the object. An example is Incandescent lightbulbs.

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17
Q

how is electrical energy created?

A

The electrical energy generates the heat that excites the atoms

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18
Q

What does phosphorescence mean? and give an example

A

Light energy is stored and later released as visible light. An example is Glow-in-the-dark items

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19
Q

what does Fluorescence mean?

A

Light (often or not always UV) is absorbed and then immediately re-emitted, usually at some other wavelength, or colour.

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20
Q

What does chemiluminescence mean?

A

Light is produced by a chemical reaction without a rise in temperature.

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21
Q

What does Bioluminescence mean? and give an example

A

a light that is produced and emitted by a living organism as a result of a chemical reaction in the organism. An example is fireflies

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22
Q

What is reflection

A

The change in direction of a light ray when it bounces off a surface.

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23
Q

What is medium?

A

The substance through which light travels

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24
Q

what is a ray?

Study These Flashcards
A

A straight line with an arrowhead that shows the direction in which light waves are travelling.

25
What is a specular reflection
A reflection of off a smooth surface like a mirror or calm body of water.
26
What is diffuse reflection
A reflection off of a rough surface such as clothing, paper and asphalt. Rough surfaces consist of a large number of different specularly-reflecting planes.
27
How do we identify ray diagrams and mirrors
Using four characteristics which is LOST
28
Classify LOST
Location: closer than, farther than or the same distance as the object from the mirror. Orientation: upright or inverted. Size: same size, larger than, or smaller than the object Type: real image or virtual image. Real images are in front of the mirror, virtual images are behind the mirror.
29
What is Fermat's principle/ law
light follows the path that will take the least time.
30
What is an incident ray?
A ray of light that travels from a light source towards a surface
31
What is the angle of incidence
The angle between the incident ray and the normal in a ray diagram.
32
what is the normal
A line that is perpendicular to a surface where a ray of light meets the surface.
33
What is reflected ray
A ray that begins at the point where the incident ray and the normal meet.
34
what is the angle of reflection?
The angle between the reflected ray and the normal in ray diagram.
35
What is dispersion?
the process of seperating colours by refraction
36
What is n in n=c/v
the substance or index of refraction
37
what is c in n=c/v
c is the speed of light in vacume which is 3.00x10^8m/s
38
what is v in n=v/v
v is the speed of light in medium
39
What is the index of refraction
the ratio of the speed of light in a vacuum to the speed of light in a given medium
40
What is refraction?
refraction is a property of light in which the speed of light and its direction of travel changes as it goes from one medium into another
41
When light travels from a medium which its speed is higher( like air) into a medium in which its speed is lower(such as water) the refracted light ray bends
Toward the normal
42
When light travels from a medium in which its speed is lower (such as water)into a medium in which its speed is higher (such as air)the refracted light ray bends...
Away from the normal
43
What is wavefront
the crests or high points of the wave
44
What is apparent depth?
light rays are refracted away from the normal | you see a virtual image of the object that looks closer than it actually is
45
If DI is negative then...
the image is behind the mirror it would be virtual
46
if HI is negative then...
the image is inverted or downright relative to the object.
47
State magnification formula
m=hi/ho=-di/do
48
In the convex mirror, the image is always...
virtual, upright and smaller
49
what is twice the distance from the mirror to the focal point?
Centre of curvature
50
what is an image that cannot be projected onto a screen
virtual
51
Light going from a light source towards a surface
incident ray
52
Something on the EM spectrum with relatively low energy
radio waves
53
Light energy is stored and then later released as visible light
phosphorescence
54
what is a rainbow
An arc of colours of the visible spectrum appearing opposite the sun, caused by reflection, refraction and the dispersion of the sun’s rays as they pass through raindrops.
55
What are sundogs
🡪occur when ice crystals in the atmosphere refract sunlight 🡪often occur on cold, clear sunny mornings (in the presence of cirrus clouds 🡪 found at high altitudes & made up of ice crystals) 🡪occur when the sun is low, near the horizon
56
What are mirages
An optical effect caused by the bending of light rays passing through layers of air that have extremely different temperatures.An optical effect caused by the bending of light rays passing through layers of air that have extremely different temperatures.
57
What is a critical angle
The angle of incidences that produce an angle of refraction of 90 degrees
58
What is total internal reflection
the phenomenon in which incident rays is not refracted but is entirely reflected back from the boundary, it occurs when light travels from a medium in which its speed is lower to a medium in which its speed is higher.
59
What does the law of reflection indicate
the law of reflection indicne that the angle of incidence is the same angle of reflection

Science-Grade 10 (4 decks)

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