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NEET2026PhysicsChapterActual

A narrow beam of light travelling in air strikes the flat surface of a transparent liquid at an angle of incidence of 45^ . If the refractive index of the liquid is 2 , what is the angle of deviation suffered by the light ray upon refraction?

Options

  1. A30^
  2. B15^
  3. C75^
  4. D45^

Correct answer

B. 15^

Step-by-step solution

Using Snell's law at the air-liquid interface: n₁ i = n₂ r Substituting the given values: 1 45^ = 2 r 1 2 = 2 r r = 1 2 r = 30^ The angle of deviation is given by: = i - r = 45^ - 30^ = 15^ Answer: 15^

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