Which of the following correctly describes the diffraction of $\mathrm{light}$?

• A. Diffraction is the bending and spreading of $\mathrm{light}$ waves as they pass through a narrow slit or around an obstacle.
• B. Diffraction is the change in frequency of $\mathrm{light}$ as it moves from one medium to another.
• C. Diffraction is the reflection of $\mathrm{light}$ from a smooth surface.
• D. Diffraction is the process by which $\mathrm{light}$ is absorbed and re-emitted by atoms.

Answer: (A)

Verified step by step guidance

1. Understand that diffraction refers to the behavior of waves, including light waves, when they encounter obstacles or openings.
2. Recall that diffraction involves the bending and spreading of waves as they pass through narrow slits or around edges, which is a fundamental wave property.
3. Recognize that diffraction is not related to changes in frequency; frequency changes occur during refraction, not diffraction.
4. Note that reflection involves waves bouncing off surfaces, which is different from diffraction where waves bend around obstacles.
5. Conclude that the correct description of diffraction is the bending and spreading of light waves as they pass through a narrow slit or around an obstacle.