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Most Important Selected Qs for JEE AdvancedPhysicsRay Optics

A ray of light is incident on a right angled isosceles prism parallel to its base as shown in the figure. Refractive index of the material of the prism is 2 . Then. which of the following statement(s) is/are true?

Options

  1. AThe refiection at P is total internal.
  2. BThe reflection at Q is total internal.
  3. CThe ray emerging at R is parallel to the ray incident at S .
  4. DTotal deviation of the ray is 150^

Correct answer

C. The ray emerging at R is parallel to the ray incident at S .

Step-by-step solution

Critical angle _ C = ⁻¹ ( 1 2 )=45^ Snell's law at points, ( n₁ ₁=n₂ ₂ ) 1 45^ = 2 =30^ At P incidence angle at P=75^ > _ C TIR at point P At Q incidence angle at Q=15^ Partial reflection and refraction at Q . As S P | Q R , emergent ray at R is parallel to incid, ray at S . Net deviation =180^

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