CUET · PHYSICS · PYQ PAPER 2025

In Snell's law of refraction, the refractive index of the second medium with respect to the first medium (\( n_{21} \)) is:

A a characteristic of the medium 1 only
B a characteristic of the medium 2 only
C independent of the angle of incidence.
D not dependent on the wavelength of light

Verified Solution

Answer & Solution

Correct Answer

(C) independent of the angle of incidence.

Step-by-step Solution

Detailed explanation

Constant Ratio: According to Snell's law, for a given pair of media, the ratio \(\frac{\sin i}{\sin r}\) remains constant. While changing the angle of incidence \((i)\) will change the angle of refraction \((r)\), their ratio (the refractive index) stays the same. Property of…

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.

Same subject

Match List-I with List-II

List -I Physical Quantity	List II Dimensional Formula
(A) Capacitance	(I) \( [M L^3 T^{-3} A^{-1}] \)
(B) Electric Flux	(II) \( [M L^2 T^{-3} A^{-1}] \)
(C) Potential	(III) \( [L^{-2} A T] \)
(D) Polarisation	(IV) \( [M^{-1} L^{-2} T^4 A^2] \)

Choose the correct answer from the options given below:

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An electron, an \( \alpha \)-particle, a proton and a neutron have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength?

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