My approach is geometrical. The incident is supposed to. I have the opinion that Usually the Fovea is 1.5 x 1.5 mm, then I suppose the one object. Object with a height of 10 m and the distance of the object from sight Proposition 0.2 meters and the dimensions of the fovea to 1.5, so I have to set the equation equal to 7.5 h 10/0.2 = h/1.5 can answer to. demonstrate the ability to light up the fovea itself.