Question

a process that modifies light waves so they vibrate in a single plane is referred to as

Answer 1

The process you're fishing for is "polarization", but that's a
misleading description.

Polarization doesn't do anything to change the light waves. 
It simply filters out (absorbs, as with a polarizing filter) the
light waves that aren't vibrating in the desired plane, and
allows only those that are to pass.

The intensity of a light beam is always reduced after
polarizing it, because much (most) of the original light
has been removed.

A laser light source may be thought of as an exception,
since everything coming out of the laser is polarized.

Answer 2

A process that modifies light waves so they vibrate in a single plane is referred to as polarization.

What is polarization?

Polarization filters out or absorbs using the polarizing filter. The

light waves which do not vibrate in the desired plane, and allows only to pass.

The intensity of a light beam reduces after polarizing it, because much (most) of the original light.

A laser light source is an example of polarized light.

Learn more about  polarization.

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