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Yr9 Energy Part 3

Definitions for light and eye

Electromagnetic radiation A form of energy that includes visible light, infrared, ultraviolet, x-rays microwaves, gamma rays and radio waves
Cornea The front part of the eye that is transparent, tough and concave in shape
Pupil The dark hole in the middle of the eye
Iris The coloured part of the eye
Lens A transparent flexible disc that is convex shaped on both sides
Retina A layer of cells at the back of the eye which are sensitive to light
Optic nerve A bundle of nerves that connects the eye to the brain
Light A source of energy that makes objects visible
Shadow An area cast by an object as a result of blocking light
Luminous A source that can light up and light up objects
illuminated Something lit up
Reflector An object that reflects light and is made visible
Transparent Objects that can let light through
Reflection Light rays that bounce of an object form a reflection
Translucent An object that lets some light through but the object seems obscure
Opaque An object that does not let light through
Angle of Incidence Angle between the incident ray and the normal
Angle of Reflection Angle between the reflected ray and the normal
Images A projection of light rays onto a screen
Lateral Inversion When an image is a side reversal of the object
Convex A mirror which bulges towards the light and makes objects smaller whether close or far away
Concave A mirror which has a curved opening facing light and makes objects appear upright and bigger (when close)
Refraction The bending of light (always towards the normal in a denser medium)
Electromagnetic waves A spectrum of energy, part of which is visible to the eye
Waves Property of how energy travels (includes sound and light)
Light Ray A single beam of photons
Incident Ray The incoming ray of light shone onto a mirror/prism/object
Reflected Ray The ray of light bouncing off a mirror/prism/object
Real Image The image that is projected in front of a mirror/lens
Virtual Image Image that is not real (often behind source)
Laterally Inverted An image that is upside down and flipped sideways
Normal An imaginary line perpendicular to the edge of the mirror or lens. If the incident ray shines on it, the reflected ray follows the same path in reverse.
Prism A triangular object which disperses light into a spectrum (ROYGBIV)
Optical density How an object’s density affects the speed of light – the more dense, the slower the speed and the greater the refraction of light/image.
Illusion The image is not real. Our brain fills in.
Visible Spectrum (ROYGBIV) A range of colours detectable by the human eye
Primary Colours Green, Blue and Red – from which all the other colours are formed.
Focal Point Point where light rays go through when reflected or refracted and where the image is most clear.
Created by: kjsime