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JEE Main202126 Feb 2021Evening ShiftPhysicsRay OpticsActual

The incident ray, reflected ray and the outward drawn normal are denoted by the unitvectors a → , b → and c → respectively. Then choose the correct relation for these vectors.

Options

  1. Ab → = a → + 2 c →
  2. Bb → = 2 a → + c →
  3. Cb → = a → - 2 a → · c → c →
  4. Db → = a → - c →

Correct answer

C. b → = a → - 2 a → · c → c →

Step-by-step solution

a → = sin θ i ^ - cos θ j ^ b → = sin θ i ^ + cos θ j ^ c → = j ^ a → - 2 a → · c → c → = sin θ i ^ + cos θ j ^

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