A prism of refractiveindex n, and another prismof refractive index n₂ arestuck together with a gapas shown in the figure. Theangles of the prism are asshown. n₁ and n₂ dependon λ, the wavelength oflight according to :n₁ = 1.20 +10.8 × 1041²n₂ = 1.45 +A60°andvolds1.80 × 1042²с70°n₁D1220⁰40°Bwhere λ is in nm.(a) Calculate the wavelength o for which rays incident at0any angle on the interface BC pass through withoutbending at that interface.

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