The Lighter Side of Life
Light Energy
–manmade (light bulbs, flashlights)
–natural (solar energy from the sun)
–Does not cause pollution
Light Rays
–travels in a ray of energy
–a ray is a thin beam of energy
–travels in a straight line
Light can travel through…..–empty space (outer space)
–gases (air)
–some liquids• Water
• Coke
• Sprite
• Milk
–some solids
Light goes in a STRAIGHT line
but you can cause it to change direction:
–Reflects or reflection (bounces off) tinted sunglasses mirror disco ball mirror
A reflection is when light rays bounce off a surface.
mirror
shiny metal
tinted sunglasses
tinted windows
The light will also change direction
if it goes something.
- refracts (bends, breaks)
through
A refraction is when light rays bend as they go
something. glass
eye glasses
cameras
microscope, hand lens and telescope
through
Refraction and Density
The more denser (thicker) the matter is….
the more the light rays are refracted (bent)!
light + density = lots of refraction!!
Lenses
We look through lenses (made of manmade glass or plastic) to see objects. The lenses cause light to refract (bend) thus making objects look larger or smaller.
Lenses can make objects appear …
larger or smaller
LargerA convex lens makes objects
appear larger.
Larger = Convex Lens
Used for:
•eye glasses
•microscope
•hand lens
•camera zoom lens
•Binoculars
smaller
A concave lens makes an object look smaller.
smaller = Concave Lens
Used for:
•eye glasses
•makeup mirror
•camera
• car side mirrors
Color My World
Surprise! White light is made up of all the colors of the rainbow put together.
This is called the color spectrum.
When white light hits something:
•Some colors from the white light are absorbed.
•Some colors from the white light are reflected.
Surprise!!!
The color that is reflected
….. is the color of the object!
All the other colors are….absorbed!
Let’s try it….
A red book
The red book is every color....
except red!
Let’s try it….
A blue car
The blue car is every color....
except blue!
Let’s try it….
A black cat
Black absorbs all colors so….
black is the absence of color!
Let’s try it….
white snow
White reflects all the colors so….
white is all the colors together!