Key words
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Image | A picture that forms in a mirror, on a screen, or by looking down a lens
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| Opaque | Matter that does not let light through
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| Pinhole camera | An image formed when light passes through a tiny hole
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| Ray | A narrow beam of light with an arrow showing direction
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| Shadow | A place where light cannot get to
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| Source | Where a wave begins
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| Translucent | Material that lets light through but scatters it
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| Transparent | A material that lets light through without scattering it
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| Angle of incidence | The angle between an incoming light ray and the normal
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| Normal | An imaginary line at right angles to the surface of a mirror or other object where a ray of light hits it
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| Angle of reflection | The angle between the normal and the ray of light leaving a mirror
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| Plane mirror | A smooth, flat mirror
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| Ray box | A piece of equipment that produces a narrow beam of light
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| Ray diagram | A diagram that represents the path of light using arrows
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| Ray tracing | A method of investigating what happens to light by marking the path of a light ray
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| Diffuse reflection | Reflection from a rough surface where the reflected light is scattered in all directions
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| Law of reflection | The angle of incidence is equal to the angle of reflection
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| Specular reflection | When light is reflected evenly so that all reflected light goes off in the same direction
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| Angle of refraction | The angle between the normal and a ray of light that has been refracted
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| Converging lens | A lens that makes rays of light come together
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| Focal length | The distance between the centre of the lens and the focal point
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| Focal point | The place where parallel rays of light are brought together by a converging lens
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| Interface | The boundary between two materials
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| Lens | A curved piece of glass or other transparent material that can change the direction of rays of light
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| Refraction | The change in direction when light goes from one transparent material to another
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| Aperture | A hole in a camera that controls how much light goes to the sensor
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| Cone cell | A cell in the retina that detects different colours of light
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| Cornea | The transparent front part of the eye which covers the iris and pupil
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| Digital camera | A camera that uses electronics to record an image
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| Iris | The coloured part of the eye
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| Memory card | Part of a digital camera that stores the images
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| Optic nerve | The nerve that takes impulses form the retinal to the brain
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| Primary colour | One of three colours (red/green/blue) that are detected by the cone cells
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| Pupil | The hole in the front of the eye that light can pass through
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| Retina | The back part of the eye that changes light energy into nerve impulses
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| Rod cell | The cell in the retina that detects low levels of light
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| Secondary colour | A colour made when two primary colours mix (magenta/cyan/yellow)
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| Sensor | An instrument that detects something
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| Shutter | The part that opens when a picture is taken to allow light to hit the sensor
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| Dispersion | The separation of colours in light
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| Filter (physics) | Something that only lets certain colours through and absorbs the rest
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| Prism | A block of clear colourless material usually triangular
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| Spectrum | The seven colour that make up white light
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| White light | The combination of primary colours
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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