Question

what do diffraction and refraction have in common? they both involve interference. they both involve wave interactions. they both involve reflection. they both involve construction.

Explanation:

Diffraction is the bending of waves around obstacles, and refraction is the change in direction 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 and is not a commonality between diffraction and refraction. Reflection is a different wave phenomenon where waves bounce back from a surface. Construction is not relevant here.

Answer:

They both involve wave interactions.