CUET · PHYSICS · PYQ PAPER 2025

To observe diffraction, the size of an obstacle

A Should be of the same order as wavelength
B Should be much larger than the wavelength
C has no relation with wavelength
D should be exactly half of the wavelength

Verified Solution

Answer & Solution

Correct Answer

(A) Should be of the same order as wavelength

Step-by-step Solution

Detailed explanation

Should be of the same order as wavelength For diffraction to be significantly observed, the size of the obstacle or aperture must be comparable to or of the same order as the wavelength of the incident wave. When the size of the obstacle is similar to the wavelength, the waves…

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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