Optics 7 Question 7

7. Assuming human pupil to have a radius of 0.25cm and a comfortable viewing distance of 25cm, the minimum separation between two objects that human eye can resolve at 500nm wavelength is

(2015 Main)

(a) 30μm

(c) 100μm

(b) 1μm

(d) 300μm

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Solution:

Resolving angle of naked eye is given by

θ=1.22λDy25×102=1.22×500×1090.25×2×102y=30×106m=30μm



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