Optics Question 718

Question: When a light wave goes from air into water, the quality that remains unchanged is its

[ RPET 1996, 2000, 03; RPMT 1999, 2000; DCE 2001; BHU 2001]

Options:

A) Speed

B) Amplitude

C) Frequency

D) Wavelength

Show Answer

Answer:

Correct Answer: C

Solution:

Let $ {\nu }’ $ and $ {\lambda }’ $ represents frequency and wavelength of light in medium respectively. so $ {\nu }’=\frac{v}{{{\lambda }’}}=\frac{c/\mu }{\lambda /\mu }=\frac{c}{\lambda }=\nu $



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