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A light of wavelength, 5000Å is coming f...

A light of wavelength, 5000Å is coming from a distant star. What is the limit of resolution of a telescope whose objective has a diameter of 200 cm ?

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The limit of resolution `Deltatheta` is given by
`Delta theta~~(0.61lambda)/a`
Here `lambda=5000Å=5000xx10^(-10)m`
`a=200/2=100 cm =100xx10^(-2)m`
putting the values we have
`Deltatheta~~3.05xx10^(-7)` radians
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