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Grade 4 Light > Grade 4 Light > Flashcards

Grade 4 Light Flashcards

1
Q

What is light?

A

Energy that is visible to the human eye.

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2
Q

What is a wave?

A

A vibration that moves energy from one place to another.

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3
Q

Explain reflect.

A

The action of light bouncing off of an object like a mirror.

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4
Q

Explain absorb.

A

When light changes to heat when entering an object, light a black shirt.

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5
Q

What does transparent mean?

A

A word that describes an object that allows light pass through it.

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6
Q

Give an example of something that is transparent.

A

Clear glass, plastic wrap.

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7
Q

What does opaque mean?

A

A word that describes anything that blocks light energy and does not allow light pass through it.

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8
Q

Give an example of something opaque .

A

A piece of wood, metal

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9
Q

Explain translucent.

A

A word that describes things which only partially block light, allowing some of it pass through.

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10
Q

What is an example of something translucent?

A

sheer curtains, paper

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11
Q

What is a shadow?

A

A dark area caused when light is blocked by an object.

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12
Q

What is an optical illusion?

A

When things look different to us then they really are- like a broken pencil in a glass of water.

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13
Q

What is a lens?

A

A special piece of glass or other transparent material that are shaped to bend or focus light, changing the way they look.

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14
Q

What is a prism?

A

A special piece of glass that separates white light into all the colors of the rainbow.

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15
Q

What is the acronym for the colors of the rainbow in the order of their appearance in the color spectrum? What does each letter stand for?

A

ROY G BIV - Red, Orange, yellow, Green, blue, indigo and Violet.

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16
Q

What are the 2 types of light sources?

A

natural and artificial.

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17
Q

What are some examples of natural light?

A

fireflies, fire, sun, lightning.

18
Q

What are some examples of artificial light?

A

flashlights, fireworks, light bulbs.

19
Q

What is natural light?

A

light sources that are not made by humans.

20
Q

What is artificial light?

A

light sources made by humans.

21
Q

What othe energy do light sources usually give off?

A

heat.

22
Q

What kind of lines does light travel in? What are these lines called?

A

straight lines called rays.

23
Q

Can light travel around corners?

A

no

24
Q

When an object is placed closely in front of a light source, what size is its shadow? Why?

A

larger, because it blocks a lot of light.

25
Q

When an object is placed far away from a light source, what size is it’s shadow? Why?

A

smaller, because it blocks less rays of light.

26
Q

To make an evenly dark shadow, should you have a large or small light source?

A

small

27
Q

A shadow with fuzzy edges occurs when?

A

When the object is farther from where the shadow falls.

28
Q

A shadow with sharp edges occurs when?

A

When the ogject is close to where the shadow falls, such as on a wall.

29
Q

The middle, darker part of a shadow is called what?

A

umbra

30
Q

The lighter outside edges of a shadow is called what?

A

penumbra

31
Q

What is meant by luminous?

A

luminous is radiating or reflecting light.

32
Q

What is meant by illuminated?

A

Illuminated is to supply or brighten with light.

33
Q

What is the clear, tough outer coating that protects the eye called?

A

The cornea

34
Q

What is the colored part of the eye that controls the opening and closing of the pupil called?

A

The iris.

35
Q

What controls the amount of light that enters the eye by opening and closing called?

A

The pupil.

36
Q

What is the part of the eye that focuses the light that enters the eye called?

A

The lens

37
Q

What forms the back wall of the eye?

A

The retina

38
Q

What carries the message from the retina to the brain?

A

The optic nerve.

39
Q

Please label this eye:

A
40
Q
A

Grade 4 Light (1 decks)

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