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2816211
Light KS3 Y7
Descrição
This is another physics subject for the year 7 end of yearexam
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Clumsy9
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Clumsy9
mais de 9 anos atrás
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Light KS3 Y7
Lumination
Luminous means a light source that emits light
Illuminated means an object on which light shines and from which light may be reflected
Opaque is an object where no light can pass through
All light is absorbed or reflected
Translucent is an object where some light passes through
It absorbs and reflects some light
Transparent means an object where all or most light passes through
Very little or no light is absorbed or reflected
Shadows
Point source is where light rays are emitted radially.
Non-point source is where rays from different part of the source form different overlaping shadow.
Umbra is a complete shadow (all rays blocked).
Penumbra is partial shadows, (some rays blocked).
Pin-hole camera
The image will be inverted
Small pin hole: focus but dimmed image
Large pin hole:unfocused but brighter image
Rays pass through the middle of the gap.
If there are two gaps, then there will be two images
Reflection
When light shines on an object, it is either transmitted, absorbed or reflected
A normal mirror is a flat plane and a regular reflector
An uneven shiny surface is a diffuse reflector
A line separates line into two and is called a normal line
The incident ray is the same angle as the reflected ray
If there was an odd number of mirrors, the image would be laterally inverted, upside down
The virtual ray is on the opposite side of the mirror and is in line with the reflection.
The virtual image is the image on the other side of the mirror
The visible spectrum
White light is a mixture of all the colours in the visible spectrum
Richard Of York Gave Battle In Vain (Red , orange, yellow, green, blue, indigo, violet)
When a white light travels through a prism it splits into its component colours
Each component bends through a different angle.
Red bends the least and violet bends the most
Some materials only reflect or transmit certain colours and asborbs the rest
The bending is called refraction and the splitting is called dispersion
In additive, red, green and blue are the primary colours
Yellow, magenta and cyan are the secondary and altogether the secondary colours make white.
In the subtractive, it is the opposite and all of them create black.
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