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Ch.12.less.12.how does light travel and interact with matter
1.
How does light
travel and interact with matter? Chapter 12: Lesson 3:
2.
Distance traveled by
light from sun to earth =90 million miles
3.
What is light
made up of? Electric waves Magnetic waves
4.
Light can travel
through vacuum. Speed of light in vacuum is faster than its speed in solid, liquid or gas.
5.
Distance between one
peak and the next in a wave. To calculate the speed of a wave: Speed = Wavelength x frequency
6.
Types of materials Transparent Translucent Opaque Allow
most light to pass through them. Allow some light to pass through them. No light can pass through them.
7.
Determine what is
transparent, translucent and opaque.
8.
When light does
not pass through opaque objects it forms SHADOWS.
9.
Position of the
SHADOW depends upon the position of the light source. Example:
10.
Draw the sunlight
rays falling on the objects.
11.
Determine the position of the
sun in the following pictures.
12.
13.
14.
To change the
size of the shadow, move closer or away from the light source.
15.
How do we
see objects? Light hits the objects and scatters (we see objects).
16.
Law of reflection: Angle
of incoming light = angle of reflected
17.
How can we
see images in mirrors?
18.
19.
Draw the light rays that
helps the girl see her image.
20.
The image in
a mirror is clear because most of the light is reflected off the mirror’s smooth surface.
21.
Look at the
spoon in the glass of water. Is the spoon broken?
22.
The spoon is
not broken. When light enters a different medium it bends and when it is leaving it bends to the opposite side again.
23.
Bending of light
while passing from on substance to another is called REFRACTION.
24.
25.
Draw the light
rays to explain what is happening.
26.
WaterAir Air Draw the
light rays to explain what is Refraction.
27.
Sunlight is white light, when
it passes through a rain drop it is divided into 7 colors.
28.
When white light
passes through a prism it comes out as a spectrum (7 colors of rainbow)
29.
The colors of
the spectrum.
30.
Each color has
a different wavelength.
31.
Red light has
long wavelength. Violet light has Short wavelength. The way we see colored objects depends on the color that is reflected.
32.
Example: The leaf is
green so it absorbs all light and green light is reflected.
33.
The apple is
red so it absorbs all light and red light is reflected.
34.
Predict what light
is reflected for you to see the color.
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