Name _____________________________________
CHAPTER 22: LIGHT
Student Notes
Light travels in a __________________ _______________________.
Light travels ________ ________________________.
-approximately ___________________________ km/ sec.
Light travels ________________ than sound.
Example:
We see things because light _____________________ into our eyes.
An object that produces light: ______________________
An object that reflects light: ________________________
A place where light is blocked creates a _____________________.
Checkpoint: True/False
1) Light travels in straight lines
2) Light travels much slower than sound
3) We see things because they light is absorbed by the objects.
4) Shadows are formed when light is blocked by an object
REFLECTION:
A reflection is the ____________________ _____________of a ray of light, heat or sound
when it hits a surface that it _________________go through
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The Law of Reflection:
Angle of ________________________ = Angle of ______________________
Draw and Label :
__________________________ ___________________is when light is scattered in different
directions.
Example: often caused by a ________________surface.
List two examples of the reflection of mirrors being used in everyday life:
1.
2.
What is WHITE light?
What are the primary colors of LIGHT?
The color that an object appears to us is the color of light that the object
_____________ .
REFRACTION:
Refraction is when waves __________ ______ or slow down due to travelling in a
different _________________.
2
A medium is something that waves will travel through. When a pencil is placed
in water it looks like this:
In the example:
In this case the light rays are __________________ ____________by the water
and are _________________, causing the pen to look odd. The two
mediums in this example are ______________ and _______.
Refraction causes a change in _______________________.
LENSES: 2 Types
•
_______________________or POSITIVE lenses will CONVERGE or FOCUS light
and can form an IMAGE.
Example: magnifying glass
•
_____________________or NEGATIVE lenses will DIVERGE (spread out) light rays
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Our eyes contain lenses:
Sunlight can act like a lens:
-Daylight is extended because of____________________.
-As light passes through our atmosphere, it will __________________________and
consequently it will_________________.
-On the horizon, light must pass though a ______________portion of air, causing any
celestial body to appear about half a degree higher on the horizon than it actually is.
-So at sunrise, we see the entire image of the sun before it physically is above our
horizon.
Selective scattering:
This is why the sky is____________________!
•
The _________________frequencies are scattered ________________by the
molecules in the atmosphere
•
_________________ ____ _____________just pass through, so the sky appears
blue.
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