The angular resolution of a `10cm` diameter telescope at a wavelength `5000Å` is of the order

Options

A. `10^(6)rad`
B. `10^(-2)rad`
C. `10^(-4)rad`
D. `10^(-6) rad`

Answer

D

Explanation

Angular resolution `=(1.22lambda)/(d)`
`=(1.22xx5000xx10^(-10))/(10xx10^(-2))`
`=6.1 xx10^(-6)~~10^(-6)rad`
Aliter : Anglar resolution `d theta=(1.22lambda)/(a)`
`=(1.22xx5000xx10xx10^(-10))/(10xx10^(-2))=6.1xx10^(-6)rad`