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
to find coefficient of viscosity of a liquid using stok''s law

A string of holiday lights has 25 identical bulbs linked in series. Every bulb dissipates 1.00 W when the string is linked to a 125-V outlet. a. How much power must be supp

Explain the laws of solid friction

Q. Illustrate about Optical Memories? In 1983 one of the most successful consumer products of all times was introduced which is compact disk (CD) digital audio system. This CD

what are the 15 major muscles in the body?

Defect: The image is formed behind the retina and lens becomes converging.

A plane monochromatic wave travelling in a homogeneous medium goes into a denser medium. What are the changes in (i) Frequency (ii) amplitude (iii) speed of propagation & (iv) Phas

Charging an Electroscope by Induction Using a Negatively Charged Balloon One general expression performed along with the electroscope includes the induction procedures of charg

Magnetism: 1. There are two types of magnetic pole north and south. 2. Like poles repel and unlike pole attract each other. 3. Magnetic substance produce magnetic field.