Question

# The angular resolution of a telescope is commonly measured in terms of the smallest angular separation $\theta_{\text {min }}$ between two objects that the telescope can resolve. If the diameter of the telescope aperture is increased, does $\theta_{\min }\mathrm{}$:(a) get smaller(b) get larger(c) stay the same

Solution

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We need to find what will happen to the smallest angular separation $\theta_{min}$ between two objects that the telescope can resolve if we increased the diameter $D$ of the aperture of the telescope.