1) What are the four conditions that need to be met for an object to be seen?
an object,
- an eye,
a source of light
- a direct path between the object and the eye.
2) An Eye and a light detector are the same in what way?
-They both detect light
3) “Brightness” means what?
- This refers to the amount of light that enters the eye
4) If there are 4 light readings 26 lux, 40 lux, 15 lux, and 250 lux;
What is the brightest reading? 250 lux
What is the least bright reading? 15 lux
5) Light travels in Straight lines.
6)Light continues traveling
-
until it reaches an object.
7) When is a shadow formed?
-
A shadow is formed behind an object that blocks the path of light.
8) How do our eyes detect a shadow?
-
A shadow is seen by detecting that less light reaches the eyes from it than from
the area surrounding it.
9) What is a reflection?
-reflection occurs when light bounces off an object only in a certain
direction.
10) Why does a reflection occur?
-A reflection occurs when the surface of the object is smooth and polished.
11) What is Scattering?
This occurs when light bounces off an object in all directions.
12) Scattering of light occurs when a surface has what sort of
qualities?
This occurs when the surface of the object is rough and unpolished.
13) A Transparent object allows light to pass through it in what way?
-
Some objects are transparent let light pass through them (in an
orderly fashion).
14) When light reaches an object it might do 3 things depending on
the object’s color, clarity, and texture. What are these three things?
-
When light reaches an object it is scattered (or reflected), transmitted, absorbed,
or some combination of these.
15) When light is absorbed by an object, it may affect the object. What is
one way it may affect the object?
-
The object will warm up or gain thermal energy.
16) When different colored lights are mixed, what happened to the color
and brightness?
-
they appear as a new color,
-
They will be brighter than the original colors.
17) Name two types of non-visible light
Radio waves, infrared light, ultraviolet light, Gamma rays
18) When all the colors of light are combined what do we see?
-
White light
19) When two or more colors combine they are brighter than the original
color. (true/false)
True
20) When an object appears red it is doing what to the red light?
-
It is reflecting the red light
21) There are different wavelengths of visible light, How does the change in
wavelength affect what we see?
-
They appear as different colors.