Why Does an Apple Look Red

1
Why Does an Apple Look Red?
Title your paper, and record each of your
observations.
2
What color of light does ared filter allow to
passthrough to your eyes?
3
What about the green filter?
4
Where is the light coming from in this
room?
5
Use the diffraction grating and look at the
roomlights.
What colors do you see?
6
If the light that fills this room is composed
of many different colors, why is it that
objectsilluminated by these lightsseem to be
onlycertain colors?
Record your answer
7
Draw this diagram on your paper
8
Our eyes and our brains interpret light of
different wavelengths as different colors.
9
Now we will connect some of these ideas together.
Can you explain why a green sheet of paper looks
green?
The starting point for your explanation should
be the light coming from the light bulb.
10
The paper appears green because the green light
reflects from it. What happens to the other
colors of light?
11
View this green rectangle with the red and green
filters and record what you see.
12
Can you explain the results you observed for the
red filter?
Green light is stopped by red filter, thus the
paper looks dark.
13
We will now pause the show and reflect on which
colors go through a red filter and which colors
are stopped.
In other words, how we were able make secret
messages.
14
Now see if you can predict how a rectangle of red
will appear through the red and green filters.
The rectangle is light red through red filter
and dark through the green filter.
15
Now see if you can predict how black and white
will look through the red and green filters.
White looks red through red filter and green
through the green filter. Black still looks black
through both filters.
16
What colors reflect off white and black surfaces?
All colors reflect off white. All colors are
absorbed by black, thus no colors reflect off
black.
17
How will red and white stripes appear through the
red filter?
The red stripes appear to disappear. Can you
explain why?