On screen there are two bright points at a distance I mm. These points are observed by the person whose eye is having diameter 3 mm from which maximum distance this person can observe them resolved ?

Options

A. 6 m
B. 3 m
C. 5 m
D. 1 m

Answer

C

Explanation

Resolution power `=(1.22 lambda)/(d)`
and `sin theta~~=(y)/(D)`
`:.(y)/(D)=(1.22 lambda)/(d)`
`:. D=(yd)/(1.22lambda)=(10^(-3)xx3xx10^(-3))/(1.22xx5xx10^(-7))=(30)/(6.1)=5 m`