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

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