WBJEE · Physics · Ray Optics
If the velocity of light in vacuum is \(3 \times 10^{8} \mathrm{ms}^{-1}\), the time taken (in nanosecond) to travel through a glass plate of thickness \(10 \mathrm{cm}\) and refractive index 1.5 is
- A 0.5
- B 1
- C 2
- D 3
Answer & Solution
Correct Answer
(A) 0.5
Step-by-step Solution
Detailed explanation
Given \(v=3 \times 10^{8} \mathrm{ms}^{-1}, d=10 \mathrm{m}\) and \(\mu=1.5\) Here, \(t=\frac{d}{c / \mu}\) \[ t=\frac{10 \times 10^{-2}}{2 \times 10^{8}} \] \(\left(\therefore \frac{c}{\mu}=\frac{3 \times 10^{8}}{1.5}=2 \times 10^{8} \mathrm{ms}^{-1}\right)\)…
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