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NEET2026PhysicsChapterActual

A composite transparent block consists of two media, Medium 1 and Medium 2, separated by a vertical interface. The refractive index of Medium 1 is 2 and that of Medium 2 is 6 . A light ray from air is incident on the horizontal top surface of Medium 1 at an angle of 45^ with the normal, as shown in the figure. After refracting into Medium 1, the ray strikes the vertical interface. Find the angle of refraction in Medi

Options

  1. A30^
  2. B45^
  3. C60^
  4. D90^

Correct answer

A. 30^

Step-by-step solution

Applying Snell's law at the first horizontal interface (air to Medium 1): 1 45^ = ₁ r₁ 1 1 2 = 2 r₁ r₁ = 1 2 r₁ = 30^ The angle of refraction r₁ is with respect to the vertical normal. The ray then strikes the vertical interface between Medium 1 and Medium 2. The normal to this vertical interface is horizontal. The angle of incidence i₂ at this second interface is 90^ - r₁ : i₂ = 90^ - 30^ = 60^ Applying Snell's law at the second vertical interface (Medium 1 to Medium 2): ₁ i₂ = ₂ r₂ 2 60^ = 6 r₂ 2 3 2 = 6 r₂ 6 2 =

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