Optics Ques 39
- A light wave of frequency $5 \times 10^{14}$ $ Hz$ enters a medium of refractive index $1.5$. In the medium the velocity of the light wave is and its wavelength is ……
(1983, 2M)
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Answer:
Correct Answer: 39.$(2 \times 10^{8} m / s, 4 \times 10^{-7} m)$
Solution:
Formula:
- $v=\frac{c}{\mu}=\frac{3 \times 10^{8}}{1.5}=2.0 \times 10^{8}$ $ m / s$
$\lambda=\frac{v}{f}=\frac{2.0 \times 10^{8}}{5.0 \times 10^{14}}=4.0 \times 10^{-7} $ $m$
BETA
