The resolving power of a telescope whose lens has a diameter of 1.22 m for a wavelength of `5000 Å` is

Options

A. `2xx10^(5)`
B. `2xx10^(6)`
C. `2xx10^(2)`
D. `2xx10^(4)`

Answer

B

Explanation

We know that,
Resolving power of telescope
`=(D)/(1.22lambda)`
Given that, `D=1.22m`
`and lambda =5000` Å
`=5000 xx 10^(-10)m`
`therefore` Resolving power
`=(1.22)/(1.22xx(5000xx10^(-10)))`
`=(10^(7))/(5)=2xx10^(6)`