Question

If you notice that two waves combine and a part of the resulting wave has less light intensity than either of the individual waves, you're observing A. destructive interference. B. polarization. C. constructive interference. D. diffraction.

Answer 1

If you notice that two waves combine and a part of the resulting wave has less light intensity than either of the individual waves, you're observing destructive interference.

Answer 2

The correct option is A.
Destructive interference is said to occur when two waves of equal frequencies and opposite phase merge in such a way that the negative displacement of one wave coincides with the positive displacement of the other thus cancelling each other out.