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BITSAT2015PhysicsRay OpticsActual

A ray parallel to principal axis is incident at 30^ from normal on concave mirror having radius of curvature R . The point on principal axis where rays are focussed is Q such that PQ is

Options

  1. AR 2
  2. BR 3
  3. C2 R -R 2
  4. DR (1- 1 3 )

Correct answer

D. R (1- 1 3 )

Step-by-step solution

From similar triangles, Q C 30^ = R 120^ or Q C=R 30^ 120^ = R 3 Thus P Q=P C-Q C=R- R 3 =R (1- 1 3 )

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