Question:medium

When a ray of light is refracted from one medium to another, then the wavelength changes from \(6000\text{ \AA}\) to \(4000\text{ \AA}\). The critical angle for the interface will be

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Key: $\lambda \propto \frac{1}{n}$
Updated On: May 8, 2026
  • \(\cos^{-1} \left( \frac{3}{2} \right)\)
  • \(\sin^{-1} \left( \frac{2}{\sqrt{3}} \right)\)
  • \(\sin^{-1} \left( \frac{2}{3} \right)\)
  • \(\cos^{-1} \left( \frac{2}{\sqrt{3}} \right)\)
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The Correct Option is C

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