1.

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 ?

Answer»

6 m
3 m
5 m
1 m

Solution :
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`


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