Question

Two stars distance two light yers are just resolved by a telescope. The wavelenght of light used in is `0.25`m. If the wavelenght of light used in `5000Å` then the minimum distance between the stars is
A. `1.22xx10^(11)m`
B. `22.44 xx10^(11)m`
C. `3.66xx10^(11)m`
D. `4.88xx10^(11)m`

Answer 1

Correct Answer - D
`(d)/(x)=(1.22lamda)/(D)`
`:.d=(1.22xx5xx10^(-7)xx2xx10^(16))/(0.25)=4.88xx10^(10)m`