Optics 2 Question 22
22. 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: 22. $2 \times 10^{8} m / s, 4 \times 10^{-7} m$
Solution:
- $v=\frac{c}{\mu}=\frac{3 \times 10^{8}}{1.5}=2.0 \times 10^{8} m / s$
$\lambda=\frac{v}{f}=\frac{2.0 \times 10^{8}}{5.0 \times 10^{14}}=4.0 \times 10^{-7} m$
