How does light help me see?
How does light interact with an object?
How do I see Color?
Is there light I cannot see?
Miscellaneous
100
What are the four components we need in order to be able to see?
1) Eye
2) Object
3) Light
4) Direct Path
100
What happens when light hits a piece of computer paper?
It is SCATTERED in many directions. Some light may TRANSMIT.
100
What color of light is a mixture of all the colors of the visible spectrum?
White light
100
Light with wavelengths our eyes are able to detect is called __________________ light.
Visible
100
Shadows form where the path of light was _____________ by an object.
Blocked
200
True or False? We don't see an object, we see LIGHT bouncing off of an object.
True
200
Who feels warmer on a sunny day: a person wearing a white or black tshirt? Why?
Black- the light is absorbed and changed into heat or thermal energy.
200
What color of light do we see when all light is absorbed and none is reflected?
Black
200
Different colors of light appear to have different colors because they have different __________________.
Wavelengths
200
True or False: Clear shadows form when there are many sources of light.
False. When there are many sources of light the shadow is fuzzy and does not have clear edges.
300
How do pupils adjust to help our sense of sight?
They enlarge in areas with less light and get smaller when there is more light.
300
Will the person see the triangle? Why or why not?
No- the path of light is being blocked by the rectangle.
300
White light shines on Peter's shirt and it looks blue. Why?
Blue light was reflected or scattered, all other colors were absorbed.
300
A type of light we cannot see that is longer than red light in wavelength and can be used to learn more about the galaxy based on the heat objects in the solar system give off is called ____________________________ light.
Infrared
300
True or False:
Light must enter the eye in order to be able to see.
True
400
Explain what is wrong with this sentence:
Nocturnal animals are awake at night so they can see when it is completely dark.
You need some light to see an object, so if it was completely dark even nocturnal animals wouldn't be able to see.
400
When light is ____________ it passes through a surface.
Transmitted
400
Green light( using a filter) shines on a green plant in a red pot. What color will the plant appear?
Green- the green light will be reflected, none will be absorbed.
400
A type of light we cannot see that is shorter than violet light in wavelength and can damage our skin if we don’t wear sunscreen is called ____________________________ light.
Ultraviolet (UV) Light
400
True or False: Light will stop traveling even if it has not yet reached an object.
False. Light only stops traveling when it is blocked by an object.
500
Light travels in a ________________ line.
Straight
500
Polishing objects allows them to _____________ more light.
Reflect
500
Green light( using a filter) shines on a green plant in a red pot. What color will the red pot appear?
Black- the green light will be absorbed and nothing will be reflected.
500
What is one type of light with a wavelength outside of the visible spectrum that we can see? Explain at least one way this type of light can be useful to us.
OPTIONS:
Radio- Transmit tv signals and important for communication
Microwaves- cell phones and radar
Infrared- detect new starts based on the heat they give off
Ultraviolet -create sterile environments and help jaundice in babies
X-ray- used in medical practices to see inside the body
gamma- can be used to help fight cancer and study black holes
500
What part of the eye contains cones and rods to sense color?
Retina