1. COLOR

2. Color Spectrum What we see determines what is interpreted Isaac Newton
first to study
using , showed sunlight is made of

3. Spectrum
spread of
(low freq -> high freq)
White light
white objects appear and colored objects appear
all colors combine to
black is the ; it all visible frequencies
black objects all light otherwise you couldn’t see them; some light

4. Color by Reflection Color of objects due Light is (like a tuning fork)
once excited to vigorous motion, send out their in all directions

5. Different materials have different natural frequencies for absorbing and emitting radiation
resonant frequencies , light is
frequencies below , light is
reemited light materials
light medium which it came if =

6. Most of some and the rest
e.g. if an object most visible light frequencies and green,
If an object light of , it will be the as the light that
If a material the light that on it, it

7. NOTE: an object can present in the illuminating light
The perceived color of an object is
depends on
Best light to determine color =

8. Color by Transmission Color of depends on the color of the
Material in glass that colored light =
Electrons in pigment atoms of certain frequencies
Light of other frequencies in the glass
Energy is , glass

9. Mixing Colored LIGHT White light comes from
ALSO comes from mixing just
Divided into three regions:
freq ( ), freq ( ), freq ( )
Combinations
red & green =
red & blue =
green & blue =

10. Complementary Colors When two colors are yellow + + green +
Not all the upon an object is ; some
part that is is from
i.e. on pigment that absorbs , reflects

11. Fig 28.10 Lighting objects with shadow of object will of light it is
Objects will not primary color

12. Mixing Colored Pigments
Mixing and is ENTIRELY different from
pigments reflect a
Color mixing by is used with pigments in and
and mixed absorbs all colors except 
Color mixing by is used in
primary colors

13. Why the sky is blue Atoms and molecules behave like and waves
, the frequency of light it will
sent in
Most UV light by
Some UV light and is by particles and molecules in
scattered the most
BUT our eyes ; our eyes  we see a

14. Increased and other , allows to
 sky is
after rains, and sky is
sky appears when there are
White clouds produced by combination of waves caused by

15. Why Sunsets are Red
When light passes thru thick atmosphere, light of while light of
@ sunset, light reaches us thru  more  remains in sunlight
Sun gets

16. Water a pale to nearly all Absorbs and resonates Resonate somewhat to
of red light
Red taken from =

17. Atomic Spectra Spectroscope analyzes All elements
The and of light can be analyzed on a
Combination and magnitude found on line spectrum
Each element has =