Minimum amount of light for low vision, Physics

Minimum amount of light for low vision

  • If 90 photons enter the eye ,10 or less are actually absorbed in photoreceptors.
  • About 3% are reflected at the surface of the cornea, and about 50% are absorbed in the various structures(cornea, lens, and humors).
  • Of these that reach the region of the rods ,only about 20% (~10%of the  original no.) are absorbed in the rods.
  • The photons that miss the rods are absorbed in the “backstop”.

Note: Some animals ,such as cuts have a reflective coating behind the rods that give  the rods another opportunity to absorb the photons ,these animals have eyes that “glowing in the dark” if a light shines in them.

Posted Date: 10/1/2012 8:49:15 AM | Location : United States







Related Discussions:- Minimum amount of light for low vision, Assignment Help, Ask Question on Minimum amount of light for low vision, Get Answer, Expert's Help, Minimum amount of light for low vision Discussions

Write discussion on Minimum amount of light for low vision
Your posts are moderated
Related Questions
working project related to logic gates

how to find ratio of magnetic dipole moment of bar magnet

A 10.0-kg object is held up by a string that will break when the tension exceeds 1.00 x 10 2 N. At what upward acceleration will the string break?

explain the refractive index of the transparent liquid using prism spectrometer?

Containers in Illustrations C and D are identical Each container is 3.25'w x 3.25'w  x 8.4'l Total capacity of each container 88.725 cubic feet Each container is filled wi

write a short note on terrestrial telescope

A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.40 m above. The brother's outstretched hand catches the keys 1.30 s later. (a) W

Q. What is the proper formula utilized to calculate acceleration? Answer:- There are some the most famous is a = F/m where F is the net force applied to a mass m. Accelera

What would happen if the principle of relativity is proved wrong?

Advantages of Integrated Circuits (ICs) over conventional circuits: (1)  Very small size- thousand times smaller than discrete circuit. (2)  Very small weight due to miniatu