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Slide 2

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Objectives
Recall that light travels in straight lines.
Draw accurate ray diagrams.
Describe how we see objects.
Define the words opaque and transparent.
Describe the images formed in a plane mirror.
Recall how the angle of incidence and angle of
reflection are related for a plane mirror.
Describe the differences between convex and
concave mirrors.
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Slide 3

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Light rays
A light ray is a narrow
beam of light. When
drawing light diagrams
always.....
1. Use a ruler.
2. Add an arrow to show
the direction the light ray
is travelling in.
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Slide 4

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How does light travel?
1) Fill a clear glass trough or empty fish tank
with smoke.
2) Shine rays of light through the tank and describe
what you see.
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Slide 5

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Light travels in straight lines
Your experiment shows that light travels in
straight lines.
What every day consequences do you think
this fact has?
You can not see around corners.
Shadows are formed in the area behind an
object where light can not reach.
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Slide 6

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Seeing objects
How do we see an object?
There are two ways we see objects.....
Do we see all objects in the same way?
We see some objects because they are light sources.
We see some objects by reflected light.
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