What is the minimum angualr separation between two stars, if a telescope is used to observe them with an objective of aperture `0.2 m`. Wavelength of light used is `5900 Å`.

Answer

`3.66 xx 10^(-6) rad`

Explanation

Here, `d theta = ? D = 0.2 m`,
`lambda = 5900 Å = 5900 xx 10^(-10)m`
`d theta = (1.22 lambda)/(D) = (1.22 xx 5900 xx 10^(-10))/(0.2)`
`d theta = 3.66 xx 10^(-6) radian`