what do diffraction and refraction have in common?\no they both involve interference.\no they both involve…

Brief Explanations:

Diffraction is the bending of waves around obstacles and refraction is the bending of waves as they pass from one medium to another. Both are wave - related phenomena involving wave interactions. Interference is mainly about the superposition of waves, reflection is about waves bouncing back, and construction is not relevant here.

Answer:

They both involve wave interactions.