CUET · PHYSICS · PYQ PAPER 2025
The refractive indices of glass and water are \( \frac{3}{2} \) and \( \frac{4}{3} \), respectively. If the speed of light in water is \( 2.25 \times 10^8 \, \text{m/s} \), the speed of light in glass will be:
- A \( 2 \times 10^8 \, \text{m/s} \)
- B \( 1.5 \times 10^8 \, \text{m/s} \)
- C \( 1.95 \times 10^8 \, \text{m/s} \)
- D \( 2 \times 10^6 \, \text{m/s} \)
Answer & Solution
Correct Answer
(A) \( 2 \times 10^8 \, \text{m/s} \)
Step-by-step Solution
Detailed explanation
\( v_g = \frac{n_w v_w}{n_g} \) \( v_g = \frac{\frac{4}{3} \times 2.25 \times 10^8}{\frac{3}{2}} \) \( v_g = 2 \times 10^8 \, \text{m/s} \)
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