Science- Light and color
lens- transparent object with one curved surface; refracts light
Two types:
1. convex: lens thicker in the center than in the middle (goes out like exit)
2. concave: lens that is thicker on the edges than in the center (goes in
like a cave)
Retina- light sensitive layer of cells in the back of the eye
optic nerve- nerv that connects the eye with the brain; transport electrical
impluses from eye to brain to intrepret
How eyes "see":
1. light bounces off an object and hits your eyes
2. cornea lets light into eye; goes through pupil; iris
muscles that open and close pupil depending on how much light is
needed; pupil is a hole in your eye that lets light in
3. lens focuses light into the retina
4. retina transfers light into electrical impulses that then travel to brain
by the optic nerve
nearsightedness-the ability to see things near, but far one needs corrective
lenses
farsightedness- tha ability to see far, but near needs corrective lenses
contact lenses-transparent lens that sits on the tear layer of the eye to
correct vision
Telescopes:
refracting- uses two or more lenses to bring the image closer
reflecting- uses a combination of lenses and mirrors ro bring image closer
Hubble Telescope- in Earth's obit outside of atmosphere; sees thing clearer
without the matter in the atmosphere getting in the way.
Seeing Color
colors of visible light- Red, orange,yellow, green, indigo, and violet
prisms- transparent objects with an angle that refracts light
rainbows are dreated by water dropplets acting like prisms refracting light,
breaking it into its colors
opaque- light cannot go through (a plastic chair)
trasparent- light can travel through (clear glass)
translucent-light can travel through a little bit
Why do we see color? light reflects off objects; some of the colors are
aborbed by the object. The colors we see is the colors that are being
reflected. This is called color subtraction
Primary colors of light are: red, blue, and green because they are mixede to
make every other color of light
