Opaque- no light passes through; absorbs and reflects light
Translucent- allows some light to pass through; cannot clearly see through the material
Transparent- can see clearly through the material
Law of reflection- light reflecting off of a surface will reflect at the same angle that it came in at.
Smooth, even surface reflect light better than rough, uneven surfaces.
Mirror images- a reflection of the image, but will be reflected back opposite
Image outside the mirror is the real image, one in the mirror is the reflected image
Bending of light due to a change in the speed because of the materials that the light is passing through.
Refracts light and projects a color
The bending breaks the waves into the different colors
Rain droplets can also diffused the light into different colors (Rainbows)
Each color has a different wavelength
The color you see is the color that is being reflected back to you, the other colors are being absorbed
Black absorbs all colors, white reflects
Filters- the color of the filter is the color of the light that it transmits
Seeing color begins with the eye
Light enters through the retina and is focused on the retina, the rods and cones take in the light and send impulses to the brain
Rods- most effective in the day and are used for distinguishing colors and shapes
Cones- used for nighttime vision and are sensitive to dim light
Color Blindness- one or more sets of your cones do not function properly
Most are red/green color blind (cones either detect reds, greens or blues)
Primary colors (of pigment)- red, blue and yellow
Other colors are a mixture of pigments
PRIMARY COLORS OF LIGHT- red, blue and green
Incandescent Light- heat a piece of metal until it glows; small wire coil (filament) inside usually made of tungsten
Also gives off thermal energy
Fluorescent lights- filled with gas at low pressure, inside coated with phosphors that emit light when they absorb UV radiation, electrodes at each end that absorb electrons, electrons collide with the gases to produce UV radiation
Neon lights- glass tubes filled with gas molecules, electric current causes collisions that produce visible light
Neon only lights up red, other gases are used to produce the other colors
Sodium vapor lights- street lights, inside is a tube filled with neon, argon and sodium metal, the gas mixture gets hot when turned on, the sodium turns to vapor which is a yellow color.
Lasers- numerous light waves at the same energy and wavelength are emitted at the same time