Angular separation, φ = 5.8 × 10–4 rad
The average distance between the two dots = 2.54/300 = 0.85 × 10-2 cm
At distance z cm, the angle subtended = 0.85 × 10-2/z
Resolution angle for human = 0.85 × 10-2/z
Maximum distance between 2 dots = z = 14.5 cm
The above distance is less than the distinct vision, which normal person cannot see.