What is a plane electromagnetic wave in physics?

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Solution

A Plane of Electromagnetic waves travels in free space along the normal direction of the combination of the two fields(electric field and magnetic).
Due to the shape of the wavefront of the em waves, it is known as the plane of electromagnetic waves.
In an electromagnetic wave, electric and magnetic fields are perpendicular to each other.
The plane of an electromagnetic wave depends on the vibrations of the electric field and magnetic field.
Electromagnetic plane waves propagate in empty space at the speed of light.

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