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  4. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 mathringA is of the order of

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Q. The angular resolution of a $10 \,cm$ diameter telescope at a wavelength of $ 5000\,\mathring{A}$ is of the order of

JIPMERJIPMER 2007Ray Optics and Optical Instruments

Solution:

Angular resolution $=\frac{1.22 \lambda}{d}$
$=\frac{1.22 \times 5000 \times 10^{-10}}{10 \times 10^{-2}}$
$=6.1 \times 10^{-6}$
$=10^{-6}$ rad