A monochromatic ray has wavelength 500 nm in a medium of refractive index 1.20. Its wavelength in a medium of refractive index 1.50 is:
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A monochromatic ray has wavelength 500 nm in a medium of refractive index 1.20. Its wavelength in a medium of refractive index 1.50 is:

G1 Physics · Accepted Answer

λ∝1/μ at fixed frequency. Thus λ₂=500×1.20/1.50=400 nm.