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Science 8 > Unit C > Flashcards

Unit C Flashcards

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1
Q

Properties of Light (hint: there are 4)

A

1) Light travels in straight lines.
2) Light can be reflected.
3) Light can be bent.
4) Light is a form of Energy.

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2
Q

Theorists of Light and Optics (KNOW ALL)
→specific names and theories

A
  • Microscope
  • Telescopes
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3
Q

Microscope

A
  • A Microscope device which allows for the viewing of Very small objects.
  • Has two lenses
    • Objective
    • Eyepiece

*When these 2 lenses are combined, you are then able to see in great details.

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4
Q

Telescopes

A
    • Telescopes both magnify and they also collect light.
  2. It proides enlarged mages of distant objects using lenses and Mirrors.
  3. There are 2 main typesof telescopes:
    -Refracting telescopes
    - Reflecting telescopes
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5
Q

China

In Ancient times

A

used mirrors

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6
Q

Archimedes

In Ancient times

A

Planned for the use mirrors in war.

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7
Q

Pythagoras

In Ancient times

A

Thought light was beams of light coming from our eyes.

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8
Q

Euclid

In Ancient times

A

Thaought that Light was reflected, and that light travels in straight lines.

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9
Q

Ptolemy

A

He thought in the 1ST Century, that Light bends when it travels from air to glass.

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10
Q

Al-Haythem

1000 AD (Middle Ages)

A

He wrote a book to help explain optics, being the first to accurately describe how vision worked.

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11
Q

Isaac Newton

1670

A

-invented the reflecting telescope.
-showed that white light is a mixture of different colors of light.

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12
Q

Ole Romer

1676

A

Determined the speed of light.

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13
Q

Albert A. Michelson

1920’s

A

He was able to determine more accurately the speed of light.

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14
Q

what is the definition of Transparent?

A

-Light travels straight through it.
EX) glass

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15
Q

What is the definision of Translucent?

A

-It allow some light to pass through.
EX) frosted window

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16
Q

What is the definision of Opaque?

A

-absorb or reflect the light
EX) brick

17
Q

Luminous vs. Non-Luminous

A

Non-luminous: does not produce light.
ex) pencil.

Luminous: produces light.
ex) lamp, sun

18
Q

What is the definision of/ somthing being Luminous?

A

Luminous: produces light.
ex) Lamp, Sun

19
Q

What is the definision of/ somthing being Non-Luminous?

A

Non-luminous: does not produce light.
ex) Pencil

20
Q

Regular Reflection vs. Diffuse Reflection?

A

Regular Reflection:
-Light rays hit a smooth surface.
-Travel PARALLEL.
-Reflect at opposite angle.
-Produces a clear image.

Diffuse reflection:
-Light rays hit a rough surface.
-Light becomes scattered.

21
Q

What is the definision of Diffuse Reflection?

A

Diffuse reflection:
-Light rays hit a rough surface.
-Light becomes scattered.

22
Q

What is the definision of Regular Reflection?

A

Regular Reflection:

-Light rays hit a smooth surface.
-Travel PARALLEL.
-Reflect at opposite angle.
-Produces a clear image.

23
Q

What is Speed of Light?

A

Light travels through space at a speed of 300 000 kilometers per second.

24
Q

What the definision of a Concave Mirror?

A

Cave in
* Image appears to be closer than it actually is.
* Focal point is in front of mirror.
* Rays come together→converging rays.
* Reflects light from a large area.
- Flashlights
- Telescopes
- Cosmetic mirror
* Image from a concave mirror depends on the object’s distance from the focal point.

  • There are 4 possibilities how an image will appear depending on the distance of the object:

1) The Object is far from the focal point that result in:
- Upside-down image (inverted)
- Smaller Size
- image lands in front of the mirror

2) The Object is closer to the focal point that result in:
- Upside-down image (inverted)
- Larger Size
- Image is in front of the mirror

3) The Object is on the focal point that result in:
- No image

4) The object is between the focal point & mirror that result in:
-Upright image
-enlarged
-The image will land behind the mirror

25
Q

What is the definision of a Convex Mirror?

A
  • Bulge out.
  • Rays spread out→ diverging rays.
  • Image appears much smaller and farther away than the object.
  • Can reflect light from a large area.
  • Focal point is in behind mirror:
    -Rear-view mirrors
    and side mirrors on cars.
26
Q

What is the definision of Refraction

A

-Reflection: light strikes a surface and bounces back off that surface.

-How it reflects depends on the Law of Reflection.

Science 8 (2 decks)

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