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Photometry and Geometrical Optics

Problem 5.45

On passing through a telescope a flux of light increases its intensity η=4.0⋅104\eta=4.0 \cdot 10^{4} times. Find the angular dimension of a distant object if its image formed by that telescope has an angular dimension ψ′=2.0∘\psi^{\prime}=2.0^{\circ}

Reveal Answer
ψ=ψ′/η=0.6′\psi=\psi^{\prime} / \sqrt{\eta}=0.6^{\prime}
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