Question

To observed diffraction, The size of the obstacle

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

Answer 1

The correct option is C

should be of the order of wavelength.

For diffraction $\lambda \approx d$ , so the size of the obstacle should be comparable to the wavelength of light.