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JEE Main20199 Apr 2019Evening ShiftPhysicsRay OpticsActual

Diameter of the objective lens of a telescope is 250 c m . For light of wavelength 600 n m coming from a distant object, the limit of resolution of the telescope is close to:

Options

  1. A1.5 × 10 - 7 r a d
  2. B3.0 × 10 - 7 r a d
  3. C2.0 × 10 - 7 r a d
  4. D4.5 × 10 - 7 r a d

Correct answer

B. 3.0 × 10 - 7 r a d

Step-by-step solution

Resolving limit of telescope = 1.22 λ D Where, D = Diameter of lens λ = Wavelength of light Resolving limit of telescope = 1.22 × 600 × 1 0 - 9 250 × 1 0 - 2 = 3 × 1 0 - 7 rad

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