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Ray Optics and Optical Instruments
Wave Optics
  1. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of
    1. 106 rad
    2. 10–2 rad
    3. 10–2 rad
    4. 10–2 rad
Correct Option: D

δφ = 1.22
λ
= 1.22
5000 × 10-10
= 1.6 × 10-6
D10 × 10-2

∴ Order = 10-6


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