Question:
Two point white dots are 1 mm apart on a black paper . They are viewed by eye of pupil diameter 3 mm . Apporoximately , what is the maximum distance at which these dots can be resolved by the eye
Answer:
Resolution limit = 1.22 x λ/D
Where,
D = Diameter of pupil in the eye = 3 nm
λ = wavelength (consider 550 mm)
Hence,
Resolution limit= distance between the dots/resolving diameter= 1 mm/d
1.22 x 550nm/3nm = 1 mm/d
D = 1mm x 3mm/1.22 x 550nm = 0.00447 = 4.47 m
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