First slide

Ray optics

Question

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A° is of the order of

Moderate

A

10⁶ rad
B

10^–2 rad
C

10^–4 rad
D

10^–6 rad

Solution

$\Delta \theta = \frac{{1.22\lambda }}{a}\$
$\Delta \theta = \frac{{1.22 \times 5 \times {{10}^{ - 7}}}}{{10 \times {{10}^{ - 2}}}}\$
= 1.22 × 5 × 10^–6 = 6 ×10^–6
Δθ is of the order of 10^-6

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