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Question: Answered & Verified by Expert
A beam of monochromatic blue light of wavelength $4200 Å$ in air travels in water of refractive index $4 / 3$. Its wavelength in water will be:
PhysicsRay OpticsWBJEEWBJEE 2009
Options:
  • A $4200 Å$
  • B $5800 Å$
  • C $4150 Å$
  • D $3150 Å$
Solution:
1310 Upvotes Verified Answer
The correct answer is: $3150 Å$
In water $\lambda=\frac{4200}{\frac{4}{3}}=3150 Å$

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