click below
click below
Normal Size Small Size show me how
Light Unit
Term | Definition |
---|---|
reflection | caused when a wave bounces off a barrier. |
refraction | caused when a wave bends as it moves through a different medium |
The eye is shaped like a | Convex Lens |
microscope | piece of equipment that uses 2 convex lenses to magnify a small object |
image | a copy of an object formed by reflected or refracted rays of light |
focal point | distance between the lens and the focal point |
opaque | an object that blocks light and forms a shadow - shade |
transparent | an object that allows light to pass completely through - window |
translucent | a material that transmits some light - stained glass |
cones | cells that allow humans to see visible light - color and detailed shapes |
luminous | an object that produces or gives off its own light |
illuminated | an object reflects light |
rods | cells in the eye that are sensitive to dim light - useful for night vision |
dispersion | when a prism breaks up white light into a band of colors |
diffuse reflection | a reflection that forms a fuzzy image |
regular reflection | a reflection that forms a clear image |
pupil | black opening that light enters the eye through |
iris | colored part of the eye controls the amount of light entering |
retina | converts the image into electrical impulses |
lens | shaped like a convex lens - refracts the light as it enters the pupil |
cornea | clear layer of the eye that protects it from dirt and bacteria |
convex lens | curve outward - rays are refracted toward each other - images appear larger |
concave lens | curve inward - rays are bent away from the lens - images appear smaller |
nearsightedness | easily see objects that are close up but not far away - corrected with CONCAVE lens |
farsightedness | easily see objects far away but not close up - corrected with CONVEX lens |