CUET · PHYSICS · PYQ PAPER 2025
Monochromatic light of wavelength \( 600 \text{ nm} \) is incident from air onto a water surface. Find the wavelength and speed of light respectively in water. (Given: Refractive index of water \( n = 4/3 \))
- A 450 nm; \( 3 \times 10^8 \text{ m/s} \)
- B 450 nm; \( 2.25 \times 10^8 \text{ m/s} \)
- C 800 nm; \( 3 \times 10^8 \text{ m/s} \)
- D 800 nm; \( 2.25 \times 10^8 \text{ m/s} \)
Answer & Solution
Correct Answer
(B) 450 nm; \( 2.25 \times 10^8 \text{ m/s} \)
Step-by-step Solution
Detailed explanation
\(\lambda_w = \lambda_a / n\) \(\lambda_w = 600 \text{ nm} / (4/3) = 450 \text{ nm}\) \(v_w = c / n\) \(v_w = (3 \times 10^8 \text{ m/s}) / (4/3) = 2.25 \times 10^8 \text{ m/s}\)
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