Question

In the eye ball image distance between eye lens and retina is 2.5 cm Find focal length maximum if the object distance is infinity and focal length minimum if the object distance is 25cm.​

Answer 1

Answer:

object focal length is for rays coming OUT OF THE EYE. But for an image on the retina, the image focal length is what one wants…. So this explains the commonly cited ~17mm focal length, but the correct value is ~22 mm focal length." Maximum focal legth occurs when you focus your eye to see objects at infinity..