Light
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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| waves | one way in which energy travels from one place to another
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| light sources | objects which give off their own light
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| electromagnetic waves | radio, micro, infra-red and ultra-violet waves are examples
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| light | a type of energy which illuminates things
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| absorb | occurs when light rays are taken in by an object
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| refract | occurs when light rays bend as they pass into a medium
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| transparent | lets all light pass through
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| energy | not a substance you can touch, but it has many forms
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| opaque | lets no light rays pass through
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| light ray | a stream of light waves
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| shadow | area where no light rays reach
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| penumbra | an area partly in shadow
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| medium | space or substance light can travel through
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| reflect | occurs when light rays bounce off an object
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| translucent | lets some light through
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| laser light | a concentrated stream of single-colour light rays
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| umbra | area of total shadow
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| laterally inverted | an image where left and right sides of the object are swapped
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| virtual image | occurs when light rays don't pass through where the image is
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| 1st Law of Reflection | the normal, incident and reflected rays lie in the same plane
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| reflection | occurs when light rays bounce off the surface of an object
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| incident ray | an incoming light ray
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| normal | an imaginary line at 90 degrees to where a light ray hits a surface
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| angle of reflection | the angle between the reflected ray and the normal
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| erect | an image that is the right way up
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| 2nd Law of Reflection | the angle of reflection equals the angle of incidence
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| image | a view of an object at a place other than where the object is
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| angle of incidence | angle between the incident ray and the normal
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| plane mirror | a mirror with flat surfaces
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| real image | occurs when light rays pass through where the image is
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| refracted ray | a light ray whose direction has been changed
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| illusion | image of an object which tricks our eyes
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| relative density | density of a substance compared to water
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| optical density | affects the speed at which light rays travel in a medium
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| prism | triangular block of glass
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| reflected ray | ray which bounces off a surface
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| scatter graph | graph with plotted points only
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| critical angle | angle of incidence which gives an angle of refraction of 90 degrees
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| total internal reflection | when light is completely trapped within a medium
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| variable | factor which can change in an experiment
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| optical instruments | objects such as binoculars, cameras and telescopes
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| refraction | a change in the direction of light as it enters a new medium
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| angle of refraction | angle between the refracted ray and the normal
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| right angle | a 90 degree angle
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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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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.
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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Created by:
MissEichler
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