Optical Device:any device that uses light.
Telescope:optical device for veiwing distant objects.
Refractig Telescopes: telescope that uses lenses.
Reflecting Telescopes: telescope that uses lenses and mirrors.
Ray Diagrams: diagram that shows how light travels.
Intensity:brightness of light.
Transparent:materials that let light pass through without reflection.
Translucent:materials that let some light through.
Opaque:materials that let no light through.
Non-Luminous:objects that don't produce light.
Luminous:materials that produce light.
Regular Recflection: reflection when light hits a smooth surface.
Diffuse Reflection:reflection when light hits a rough surface.
Plane Mirrors:flat mirror.
Incident Rays:ray of light that arrives at a mirror.
Normal:line perpindicular to surface.
Angle of Incidence: angle between incident ray and normal.
Angle of Reflection:angle between reflected ray and normal.
Law of Reflection: angle of incidence=angle of reflection.
Focal Point:point where light rays meet.
Concave Mirror:reflecting surface curved inward.
Convex Mirror:reflecting surface that bulges out.
Refraction:bending of light.
Lens:curved peice of glass.
Convex Lens:transparent material that bulges outwards.
Real Image:image formed when rays meet.
Concave Lens:peice of trnsparent material curved inwards.
Wave Model of Light: model used to describe the characteristics of light.
Radio Waves:electromagnetic radiation used for communication.
Microwaves:electromagnetic radiation used to cook food.
Infared Waves: electromagnetic waves that are invisible but can be felt as heat.
UV Light: electromagnetic radiation that can cuse skin cancer.
X Rays:electromagnetic radiation used to see inside a human body.
Gamma Rays: electroagnetic radiation used to cure cancer.
Electromagnetic Radiation:all forms of radiant energy.
Electromagnetic Spectrum: refers to whole range of wavelengths.
Radar: radio detecion and ranging.
Invisible Spectrum: parts of the spectrum humans can't see.
Incadescent: form of artificial light that uses electricity.
Flourescent:form of artificial that uses UV light.
Phosphor: substance that emits light.
Phosphorescence: process where a substance emits light.
Bioluminescence:the ability of organisms to create light.
Photophore:light producing organ.
Primary Colours:red, green, and blue light.
Secondary Colour:yellow, cyan, and magenta.
Theory of Colour Addition: theory of what happens when colored lights are mixed together.
Pupil:opening in eye that lets in light.
Apeture:hole in camera that lets in light.
Iris:band of muscle that lets in light.
Diaphragm: part of camera that changes apeture size.
Shutter:part that acts as a door on a camera.
Retina:special lining at the back of the eye.
Photoreceptors: light sensitive cells in the eyes.
Rods:parts in nthe eye that are sensitive to light.
Cones:cells in the eye that detect colour.
Optic Nerve:nerve that leads from the retina to the brain.
Film: material sensitive to light.
Nocturnal:animals active at night.
Ommatidium: unit of a compound eye.
Compound Eye: eyes made up of smaller units.
Digital Imaging: process of creating an image with a computer.
Charge Coupled Device:device that converts light into electricity.