Question

An inkjet printer uses tiny dots of red, green, and blue ink to produce an image. Assume that the dot separation on the printed page is the same for all colors. At normal viewing distances, the eye does not resolve the individual dots, regardless of color, so that the image has a normal look. The wavelengths for red, green, and blue are λred = 660 nm, λgreen = 550 nm, and λblue = 470 nm. The diameter of the pupil through which light enters the eye is 2.0 mm. For a viewing distance of 0.5 m, what is the maximum allowable dot separation

The contacts worn by a farsighted person allow her to see objects clearly that are as close as 25.0 cm, even though her uncorrected near point is 62.0 cm from her eyes. When she is looking at a poster, the contacts form an image of the poster at a distance of 238 cm from her eyes. (a) How far away is the poster actually located? (b) If the poster is 0.390 m tall, how tall is the image formed by the contacts?

Answer 1

The retina patterms and the dot sources in front of the ayo have the same angular Seperation o simo= 100l2 a=0.000m sino=1.224 Д8 os ay - 1.22xXO.5 DY = 305d giving a max obt seperation Dy (max)=305x470x10-9 (Ag (max)= 1.4335x10 m.