# Science; Light Waves

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Angle of Reflection
The angle between the reflected ray and the normal (the imaginary line drawn at 90 degrees to the reflecting surface).
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Density
The ratio of mass to volume. It is usually measured in grams per cubic centimetre or grams per cubic decimetre.
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Dispersion
Spreading out of the different wavelengths of light, caused by refraction of light as it passes through a prism.
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Frequency
The number of waves produced each second. The unit of frequency is hertz, 'Hz'.
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Incident Ray
Light ray moving towards a surface or boundary.
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Lens
A transparent tool that can change the direction of a ray of light.
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Reflected Ray
Light ray leaving a surface or boundary.
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Refraction
Process by which a wave changes in speed and sometimes direction upon entering a denser or less dense medium. For example, a light ray changes direction when refracted by a lens.
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Retina
The light-sensitive area on the back of the eye. Light must be focused on the retina in order to see clearly.
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Spectrum
A series of similar waves arranged in order of wavelength or frequency.
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Translucent
Allows light to pass through but is not completely clear.
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Transparent
An object that is see-through.
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Transverse
At 90 degrees. In transverse waves, the vibrations are at 90 degrees to the direction in which the waves travel.
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Vacuum
A volume that contains no matter.
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## Other cards in this set

### Card 2

#### Front

The ratio of mass to volume. It is usually measured in grams per cubic centimetre or grams per cubic decimetre.

Density

### Card 3

#### Front

Spreading out of the different wavelengths of light, caused by refraction of light as it passes through a prism.

### Card 4

#### Front

The number of waves produced each second. The unit of frequency is hertz, 'Hz'.

### Card 5

#### Front

Light ray moving towards a surface or boundary.