Question

To observe diffraction, the size of the obstacle

• A. has no relation to wavelength.
• B. should be $\lambda / 2,$ where $\lambda$ is the wavelength
• C. should be much larger than the wavelength
• D. should be of the order of wavelength

Answer 1

Answer: (D)

should be of the order of wavelength

Answer 2

To observed diffraction, the size of the obstacle should be of the order of wavelength. i.e. $\lambda=d$.