Transcript light lecture - Mr. Hill's Science Website

The Principles
of Light
A light source is anything that
produces light.
Examples of light sources.
What happens when light hits an
object?
Light is reflected off the object.
We see things because of
reflected light.
We see ourselves in a
mirror because of
reflection.
Why do we see color?
We see red because red light is
reflected off the object.
All other colors are absorbed.
source: tomdalling.com
The light that hits
an object is called
the angle of
Wikipedia
The light that
bounces off the
object is called
the angle of
reflection.
incidence.
Angle of incidence =
Angle of reflection
Fraunhaufer
This is called the law of
reflection.
Click here for Reflection
video clip.
When light passes thru
transparent objects (water, glass,
etc.), the light is bent.
We say light is refracted.
When light passes
thru water, it’s
refracted.
When light travels thru a prism,
the refraction forms the spectrum.
The spectrum is the colors of the
rainbow…
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The spectrum – Red, Orange, Yellow,
Green, Blue, Indigo, and Violet (ROY
G. BIV) make up the colors of the
rainbow (video).
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Click here for Rainbows and
Blue Skies video clip.
Click here for Refraction
Basics video clip.
Three things can happen when
light hits an object.
If the object is transparent, it
will pass through it.
If the object is translucent, light
looks fuzzy it passes through it.
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If the object is opaque, the
light will not pass thru the
object and is reflected.
Review I
The Presentation
Ends Here.