KCET · Physics · Magnetic Properties of Matter

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.

Verified Solution

Answer & Solution

Correct Answer

(D) should be of the order of wavelength.

Step-by-step Solution

Detailed explanation

Diffraction is phenomena of spreading of light around obstacles. Diffraction of light occurs when light passes through a slit that has size of the order of wavelength of light or evensmaller than it.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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