Optics Question 841
Question: A beam of monochromatic light is refracted from vacuum into a medium of refractive index 1.5. The wavelength of refracted light will be
Options:
A) dependent on intensity of refracted light
B) same
C) smaller
D) larger
Show Answer
Answer:
Correct Answer: C
Solution:
[c] From $ \mu =\frac{c}{v}-\frac{n{\lambda _{v}}}{n{\lambda _{m}}} $ , $ {\lambda _{m}}=\frac{{\lambda _{v}}}{\mu } $
Here, c = velocity of light in vacuum and v= velocity of light in medium m= refractive index of the medium.
Hence, wavelength in medium $ ({\lambda _{m}})<{\lambda _{v}}(\because \mu >1,given) $
So, the required wavelength decreases.
