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

Explanation

A 100 inch telescope implies that a = 100 inch = 254 cm. Thus if,
`lamda = 6000Å = 6 xx 10^(-5) cm ` then
`Delta theta = (1.22 lamda)/(a) = 2.9 xx 10^(-7) ` radians