Diffraction: Bending of waves through openings

Steps:

• Recall diffraction as the spreading of waves around obstacles or through apertures.
• Examine each option for wave behavior matching diffraction.
• Eliminate options describing reflection, refraction, or interference.
• Identify the option involving passage through an opening.

Why C is correct:

• Diffraction occurs when waves pass through an aperture, causing bending and spreading due to the wave nature, as per Huygens' principle.

Why the others are wrong:

• A describes reflection, where waves bounce off a surface.
• B describes refraction, where waves change speed and direction at a medium boundary.
• D describes interference, where waves from multiple sources overlap and combine.

Final answer: C