First slide

Ray optics

Question

The angular resolution of a telescope having diameter of 12.2 cm with a wavelength of 6000 Å is of the order of

Easy

A

$10^{- 2} r a d$
B

$10^{- 4} r a d$
C

$10^{- 10} r a d$
D

$10^{- 6} r a d$

Solution

Angular resolution $θ = \frac{1.22 λ}{D}$
$\begin{array}{l} D = 12.2 c m \\ λ = 6 \times 10^{- 7} m \\ θ = 10^{- 6} r a d \end{array}$

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