Transcript lecture

The Principles
of Heat, Light,
& Sound
Light
To have light, you must have a light
source.
Sources of light…
Sun
Light Bulb
Fire
What happens when light hits an object?
The light is reflected off the object.
We see things because of reflected light.
Why do we see colors?
We see a color because that color is
reflected off the object.
We see blue because blue is reflected
off the object.
We see ourselves in a mirror because of
reflection.
The light that hits an object
is called the angle of incidence.
The light that bounces off the object
is called the angle of reflection.
The Law of Reflection
Angle of incidence = Angle of reflection
What is Reflection of Light?
Law of Reflection
When light passes thru transparent
objects (water, glass, etc.), the light is
refracted (bent).
When light passes thru
water, it’s refracted.
Optics for Kids – Refraction
Refraction of Light
Gelatin Fiber Optics
When light travels thru a prism, the
refraction forms the colors of the
spectrum.
The spectrum is the colors of
the rainbow…
Red, Orange, Yellow, Green,
Blue, Indigo, and Violet
(ROY G. BIV).
Refraction of Light
White is made up of all the colors of the
spectrum (all colors are reflected).
Black is the absence of color (all
colors are absorbed and none
are reflected.
How Do We See Color?
Adventure in Color
Three things can happen when light hits
an object.
If the object is transparent, it will pass
through it (think window).
If the object is translucent, light is
diffused as it passes through it
(think plastic milk carton).
If the object is opaque, the light will
not pass thru the object and is reflected
(think wall).