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

Explanation

Diameter of objective of telescope,
D=100inch=`100xx2.54 cm=254 cm`
`lamda=6000Å=6000xx10^(-8)cm=6xx10^(-5)cm`
Limit of resolution of telescope,
`dtheta=(1.22lamda)/D=(1.22xx6xx10^(-5))/(254)=2.9xx10^(-7)rad`