Light Sources And Traveling Light Sheet
ADVERTISEMENT
1
2Absorbing and Reflection Light:
Light Energy and Its Sources
Less Absorbent Materials
More Absorbent Materials
Light: a form of energy that can be detected by the human eye
Light Sources and
Asphalt
How does light allow us to see objects?
White and light-coloured
Black and dark- coloured
Light energy from electric sources must spread throughout the
Shiny and smooth – plaster
Dull and rough- stucco
room. Some of it bounces off objects and then travels to your
Traveling Light
These factors can play an important role in design choices for
eyes enabling you to see objects and people in the room
homes, posters, magazines and clothing to provide
appropriate temperature and contrast.
Luminous sources:
Light from:
Description
Examples
.
Fluorescence
- emitting light while
- Fluorescent tubes
receiving energy from
Sources:
other sources
Sun- the most important natural source of light
Phosphorescence
- give off light for a
- glow in the dark light
Artificial sources of light are created by people ie. Lightbulb
short time after you
switches
shine light on them
- luminous dials on
Luminous objects- emit energy in the form of light (sun, candles)
- store energy and
some watches
- input energy such as chemicals, electrical, nuclear
release it gradually
- glow in the dark
or thermal energy transform into light
Energy travel:
stickers
Nonluminous objects- do not emit light, but only reflect if from
Electricity tube particles of
Electric Discharge
- when electricity
- lightning
other sources eg. the Moon
mercury vapor emits ultraviolet
passes through a gas,
- neon lights
(UV) energy UV energy absorbed
the gas particles can
Getting in Light’s Way:
by phosphor coating coating
emit light
emits light that can be seen
Transparency- measure of how much light can pass through a material.
Incandescence
- Emit light due to
- kerosene lamp
high temperatures
- incandescent light
Transparency Description
Example
Transparent
-allows all
- window
- not efficient
bulb
- glasses
light to pass
Chemiluminescence
- process of changing
- safety lights
- glass of
through
chemical energy into
- glow sticks
water
light energy with little
Translucent
-allows some
-skin
or no chance in
- sunglasses
light to pass
thin wall separates
temperature
- paper
through
two chemicals when
Bioluminescence
- living things that
-fire-flies
wall is broken the
Opaque
- allows no
- brick wall
make themselves
-glow worms
- lunch box
light to lass
chemicals mix and
luminous using
- some fish, squid,
- spoon
through
chemical reactions
bacteria and fungi
react to produce light
*note: Large amounts of transparent material may become
translucent or opaque and you cut an opaque material into very
thin slices, they will be translucent rather than opaque.
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education