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InterviewSolution
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The speed of light in air is 3 × 10^8 m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.(a) 0.5 × 10^-10 s(b) 5 × 10^-10 s(c) 50 × 10^-10 s(d) 500 × 10^-10 sThis question was addressed to me by my college professor while I was bunking the class.Asked question is from Wave Optics in section Wave Optics of Physics – Class 12 |
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Answer» CORRECT choice is (b) 5 × 10^-10 s To explain I would say: VG = \(\frac {c}{\mu } = \frac {(3 \times 10^8)}{(1.5)}\) = 2 × 10^8 m/s. Time, t = \(\frac {DISPLACEMENT}{v_g}\) t = \(\frac {(10 \times 10^{-2})}{(2 \times 10^8)}\) t = 5 × 10^-10 s. |
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