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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 `Delta theta` is given by `Delta theta=(0.61 lamda)/a`
Here `lamda=5000A=5000 times 10^-10 m`
`a=200/2=100 cm=100 times 10^-2 m`
Putting the values we have `Delta theta approx 3.05 times 10^-7` radians.
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