CUET · PHYSICS · PYQ PAPER 2025

When light passes from air to glass, then

A its wavelength increases and velocity decreases.
B its wavelength and velocity both decrease.
C its wavelength decreases but velocity increases.
D its wavelength and velocity both increase.

Verified Solution

Answer & Solution

Correct Answer

(B) its wavelength and velocity both decrease.

Step-by-step Solution

Detailed explanation

Its wavelength and velocity both decrease. The wavelength of light also decreases when it moves into a denser medium. The relationship between the wavelength in air ( \(\lambda_{\text {air }}\) ) and the wavelength in the new medium (glass, \(\lambda_{\text {glass }}\) ) is…

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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