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What is the minimum angular separation between two stars if a telescope is used to observe them with an objective of aperture 20 cm?

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What is the minimum angular separation between two stars if a telescope is used to observe them with an objective of aperture 20 cm? The wavelength of light is 5900 Å.

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Data : D = 20 cm = 0.2 m,

λ = 5900 Å = 5.9 × 10-7 m

This is the required angular separation.

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