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Question

LIght of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 2.00 m. What will be th eradius of the central bright spot formed on the wall?
 


Solution

λ=560nm=560×109m,d=0.20mm=2×104m,D=2m
Since, R=1.22λDd=1.22×560×109×22×104=6.832×103M=0,683cm
So diameter = 2R = 1.37 cm
 

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