The Escences:
Incandescence
Light emmited by a hot object
Ex. Light bulb, sun, fire
Converging is the same as...
Convex
Hyperopia
Name FOUR keys points
-Eyes can't focus on close objects
- Image is formed behind retina
- Converging lens to correct it
- "Far-sighted"
Explain how a rainbow occurs...
Sun light seems white to the human eye but is actually made up of all colours of the rainbow. When it passes through a denser medium, it slows down and bends. A rainbow occurs when light from the sun reflects off of tiny water droplets in the sky and the dispersion of the rays as they pass through. When the light rays are inside the droplet, it reflects off the back of the droplet, changing direction. As the light exits, it bends again and since different colours have different wave lengths, they bend at different angles.
What is the Law of Total Internal Reflection?
The angle of incidence equals the angle of reflection
Fluorescence
A substance absorbs high energy light and emits a glow
Ex. Neon highlighters
Diverging is the same as...
Concave
Name FOUR key points
- eyes can't focus on distant objects
- image forms in front of retina
- diverging lens to correct it
- "near-sighted"
Define a sundog...
A sundog occurs when the sunlight refracts off of light crystals in the atmosphere. They occur when the sun is low and near the horizon. Sundogs are bright spots of both sides of the sun.
A convex mirror is always...
Virtual, upright, and smaller
Phosphorescence
Material absorbs light, holds onto it, then releases it over a long period of time
Ex. Glow in the dark bed room stars
Convex is the same as...
Converging
Presbyopia
Name TWO key points
- lens stiffens and loses ability to move as a person ages
- cilliary muscle can no longer change shape of the lens
An optical effect in which the image of an object appears closer than the object. As an image is formed by reflection, an image is formed by the refraction of light
What kind of lens could you use to make a fire?
Convex
Chemiluminescence
Light produced directly by a chemical reaction
Ex. Glow sticks
Diverging is the same as...
Concave
Astigmatism
Name TWO key points
- blurred/distorted vision
- due to incorrect shaped area
Shimmering is the movement of objects in hot air
Mirages are an optical effect caused by the bending of light through objects with extremely different temperatures caused by refraction of light in uneven heated air.
Which colour has the longest wavelength, and which has the shortest
Purple has the shortest wavelength and red had the longest
Bioluminescence
Light produced by a living organism
Ex. Fireflies, jelly fish
Define fiber optic cables
These transmit data using pulses of light through ultra-pure strands of glass or plastic
A security mirror works by reflected light rays diverging so that you can see a larger area
Define a radar antenna
A radar antenna is when incoming radio waves are detected to a detector located at the focal point of a dish
Define a solar oven
A solar oven is focused on a cooking surface which is located at the focal point.