Optics Question 727

Question: For a colour of light the wavelength for air is 6000AA and in water the wavelength is 4500AA . Then the speed of light in water will be

Options:

A) 5.×1014m/s

B) 2.25×108 m/s

C) 4.0×108 m/s

D) Zero

Show Answer

Answer:

Correct Answer: B

Solution:

v∝λ⇒v1v2=λ1λ2

∴ v2=v1λ1×λ2=3×108×45006000=2.25×108 m/s

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