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In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size λ/(100), where λ is the wavelength of the wave in free space. The phenomenon, which happens there will be

Asked in JEE Main 26th June 1st Shift 2022 · Resolving power and limits of ray optics

• (1) Reflection
• (2) Refraction
• (3) Diffraction
• (4) Scattering

Step-by-step solution

Why the other options are wrong

• (1) Reflection needs a surface much larger than the wavelength.
• (2) Refraction needs an extended medium, not an object a hundred times smaller than λ.
• (3) Diffraction is noticeable when the obstacle is comparable to λ, not much smaller.

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