Lenses that make parallel light rays come together.
200
How does incandescent light bulbs produce light?
This light bulb has a tiny tungsten wire that gets very hot and glows brightly when the electric current runs through it.
200
What is reflection?
The process in which light "bounces off" a surface and changes direction.
200
What is an incident ray?
The light ray travelling toward the mirror or other surface.
200
Where is refraction used?
Refraction is used in fibre optics communications such as high-spreed Internet.
200
What is lens?
A thin, transparent piece of glass or plastic that has at least one curved side. The sides may be concave, convex, or plane.
300
What is fluorescent lighting?
This light bulb last longer than incandescent bulbs. However, becuase they contain mercury, they can only be disposed of at hazardous waste centers.
300
What is a colour wheel?
This summarizes additive and subtractive primary colours, the secondary colours, and the complementary colours. It also includes another category of colours called tertiary colours.
300
What is a convex mirror?
Light rays that travel toward this mirror parallel to the principal axis, the reflected rays spread out and are extended backwards behind the mirror to the focal point.
300
What is an optical fibre made of?
Made of a tiny glass fibre called the core that is about the size of a human hair. A cladding made of a different type of glass covers the core.
300
What is farsightedness?
You find the image of a close object blurry because the image is focussed behind the retina. This can be corrected with a converging lens.
400
How is bioluminescence light produced?
This light is produced by living organisms. Chemcial reactions in the living cells produce light.
400
What is absorbtion?
The process in which light energy remains in an object and is converted into heat. No light is reflected from an object that absorbs light.
400
How do you draw a ray diagram for plane mirrors?
You need just two rays reflecting from a mirror to find the point where the reflection of an object is located. The point where the two reflected rays meet is the location of the image (the reflection of the object).
400
What is total internal reflection?
The condition in which no light can escapre the medium because the angle of incidence is larger than the critical angle. This could be applied to any type of mirror.
400
What is the difference between a converging lens and a diverging lens?
Converging lens makes light rays come together. Diverging lens make light rays move apart.