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JEE Main20198 Apr 2019Evening ShiftPhysicsRay OpticsActual

Calculate the limit of resolution of a telescope objective having a diameter of 200 c m , if it has to detect light of wavelength 500 n m coming from a star.

Options

  1. A305 × 10 - 9 radian
  2. B610 × 10 - 9 radian
  3. C152.5 × 10 - 9 radian
  4. D457.5 × 10 - 9 radian

Correct answer

A. 305 × 10 - 9 radian

Step-by-step solution

Limit of resolution of the telescope = 1.22 λ D θ = 1.22 × 500 × 10 - 9 200 × 10 - 2 = 305 × 10 - 9 radian

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