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Yr9 Energy Part 3
Definitions for light and eye
| Term | Definition |
|---|---|
| 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
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