A beam of monochromatic blue light of wa

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Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

A beam of monochromatic blue light of wavelength 440nm in air travels in water ( μ= 4/3). What will be its wavelength in water?

Options:

330nm

340nm

440nm

430nm

Correct Answer:

330nm

Explanation:

λ ∝ 1/μ

λ₂/λ₁ = μ₁/μ₂

λ₂ = (3/4)x 440 (since μ₂₁ = 4/3 and λ₁ = 440nm)

= 330nm