Q14 of 23 Page 64

The human eye has an approximate angular resolution of ϕ = 5.8×10–4 rad and a typical photo printer prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance z should a printed page be held so that one does not see the individual dots.

Given,


ϕ = 5.8×10–4 rad, printing rate=300 dpi=300 dots/2.54 cm


Let the distance between two dotes be L




At a distance Z angle subtended will be,







∴ the minimal distance Z should a printed page be held so that one does not see the individual dots is 14.5 cm


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