Light wave is a type of Transverse wave
All electromagnetic waves, including light, are transverse waves because they vibrate energy perpendicular to the wave's direction of travel. In a gas or a liquid, transverse waves cannot travel because there is no mechanism for generating motion perpendicular to the wave's direction of propagation.
A medium is not needed for the propagation of a light wave. It is therefore a non-mechanical wave. A light wave's electric and magnetic fields oscillate in a direction opposite to the direction in which the wave is traveling. This makes it a transverse wave.
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