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KVPY2014PhysicsRay Optics

A concave mirror of radius of curvature R has a circular outline of radius r. A circular disk is to be placed normal to the axis at the focus so that it collects all the light that is reflected from the mirror from a beam parallel to the axis. for r < < R , the area of this disc has to be at least

Options

  1. Ar⁶ 4 R⁴
  2. Br⁴ 4 R²
  3. Cr⁵ 4 R³
  4. Dr⁴ R²

Correct answer

A. r⁶ 4 R⁴

Step-by-step solution

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