Assuming that the human pupil has a radius of 0.25 cm and a comfortable viewing distance of 25 cm. The minimum separation between two point objects that the human eye can resolve for the light of wavelength 500 nm is
A
300 
m
m
B
1 
m
m
C
30 
m
m
D
100 
m
m
Text Solution
Verified by ExpertsThe correct answer is:
C
30 
m
By Fraunhofer diffraction through a circular aperture, 
d = diameter of pupil = 2 x 0.25 = 0.5 cm
= 500 nm
First dark ring is formed by the light diffracted from the hole at an angle 
with the axis.
Viewing distance, D = 25 cm
Minimum separation between 2 objects = D 
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