Q104 / 160 · JIPMER 2007 · Physics

The angular resolution of a 10 cm diameter telescope at a wavelength of $5000 Å$ is of the order of

  • A
    $10^6 \mathrm{rad}$
  • B
    $10^{-2} \mathrm{rad}$
  • C
    $10^{-4} \mathrm{rad}$
  • Correct answer
    D
    $10^{-6} \mathrm{rad}$

Solution

Angular resolution $=\frac{1.22 \lambda}{d}$ $\begin{aligned} & =\frac{1.22 \times 5000 \times 10^{-10}}{10 \times 10^{-2}} \\ & =6.1 \times 10^{-6} \\ & \approx 10^{-6} \mathrm{rad}\end{aligned}$

Hence, the correct answer is option: 'D'.

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