Electromagnetic waves, such as visible light, travel in a multitude of orientations. a substance that filters the light so that it only passes through in one plane works somewhat like a fence that allows only some light to pass through. this is the principle of - a. refraction. b. diffraction. c. polarization. d. interference.

I believe this is the principle of polarization.
It is the property of electromagnetic waves such as light waves, in which the direction and magnitude of the vibrating electric field are related in a specific way. Electromagnetic waves are the types of waves that do not require a material medium for transmission and travels with the speed of light.

27. =3,500,000 x 4,000 = 14,000,000,000

The disturbance is only parallel to the motion of the wave.