Topic 10 Visible Light
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The properties of light are: (list three properties)
Light is emitted by luminous objects Light travels in straight lines Light travels much faster than sound
The change in direction of a wave passing from one medium to another caused by it’s change in speed.
Refraction
Spreading of something over an area.
Dispersion
Light travels to the material and is unable to travel any further.
Absorbed light
Light that has changed direction, but continues to travel in the original material.
Reflected light
Length of one wave pattern.
Wavelength
Number of waves that move past a certain point in one second
Frequency
Materials that allow all light to pass through.
Transparent
Let light through but scatter it.
Translucent
Materials that do not let light through (they absorb or reflect the light).
Opaque
To send (as in sound or light). It also means light passing through an object.
Transmit
The order of colours in the visible spectrum:
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Light ray which hits the surface.
Incident ray
Ray which is reflected from the surface.
Reflected ray
Imaginary line drawn perpendicular to the surface.
Normal line
Angle between the incident ray and normal line.
Angle of incidence
The angle between the reflected ray and normal line
Angle of reflection
The colour of light which is refracted the least by a triangular prism.
Red
The colour of light which is refracted the most by a triangular prism.
Violet
A lens which has two sides that curve inwards.
Biconcave
A lens which has one side that curves outward.
Convex
Shadows: an object far from a light source makes a …………………….. shadow.
small
Shadows: an object close to a light source makes a …………………. shadow.
big
The law of reflection
The angle of incidence is equal to the angle of reflection.