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Assume that light of wavelength 6000Å is...

Assume that light of wavelength `6000Å` is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inch?

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A 100 inch telescope implies that `2a = 100 "inch" = 254 cm.` Thus if,
`lambda~~6000Å=6xx10^(-5)cm`
then
`Delta theta~~(0.61xx6xx10^(-5))/(127)~~2.9xx10^(-7)" radians"`
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