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

Forging:   Forging is shaping of metal either by impact or steady compression among a hammer or ram and anvil. Related to hammering or pressing of metal, the main difference among

A) Explain the flow of direct current? ( describe direct current) b) Explain  the effect of resistance in circuits? (Describe  effect of resistance)

Each physical system has related with it a certain point whose motion characterizes the motion of the whole system. When the system goes under some external forces than this point

examples of like and unlike forces for class 9

Define Railway Tanker? A long, cylindrical tank is placed on a carriage that is able to slide without friction on. The mass of the empty tanker is M=180 kg at first the tank is

a closed organ pipe resonates with frequency 6hz and an open organ pipe resonates with frequency 12Hz. if the two organ pipes are joined to form a single organ pipe then it will re

12 joule of work has to be completed against an existing electric field to take a charge of 0.01 C from A and B. How much is the potential difference VB-VA.

Light described at a place by the equation E=100[sin(5*10^15)t + sin(8*10^15)t] falls on the metal surface having work function 2eV.calculate the maximum kinetic energy of photoel

write a short note on terrestrial telescope