Minimum amount of light for low vision, Physics

Assignment Help:

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.

Related Discussions:- Minimum amount of light for low vision

Determine the tension on the nail, A block is placed under the head of the ...

A block is placed under the head of the claw hammer to aid in removing the nail. The pull on the handle is P39 N, the angle of the hammer to the vertical is P40 and the length of

ELECTROSTATIC ., two insulated charged copper spheres A and B of identical ...

two insulated charged copper spheres A and B of identical size have charge q and -3q respectably .when they are brought in contact with each other and then separated,what are the n

What are the pumping schemes, What are the pumping schemes? Pumping Sch...

What are the pumping schemes? Pumping Schemes: a. Optical pumping through photons b. Electrical pumping through electric glow discharge/electric current/electron beam

Action and reaction in pushing forces, Action and reaction in pushing force...

Action and reaction in pushing forces Forces work in pairs. If you push against a wall, the wall pushes with equivalent force back against you. Secure two kitchen spring balanc

Characterictic graph of diode, for silicon and germinium

for silicon and germinium

Determine the object direction, Q. If the net force acting on an object is ...

Q. If the net force acting on an object is in the positive x-direction, the object moves only in the positive x-direction. It is not true, the object will accelerate only in the

Fund physics, A high-performance dragster with a mass of m = 1333 kg can ac...

A high-performance dragster with a mass of m = 1333 kg can accelerate at a rate of a = 23.5 m/s2. Write an expression for the magnitude of the net force, FNET, that propels the dr

How long does it take for the water to reach boiling point, How long does i...

How long does it take for the water to reach the boiling point? An iron boiler of mass 230 kg contains 830 kg of water at 18C. A heater supplies energy at the rate of 52,000 kj/

Lamis theorem, a particle of xkg pended by two light inextensible strings o...

a particle of xkg pended by two light inextensible strings of AB and BC of lengths 8cm and 6cm respectively with the mass x attached to B. The end A and C are fixed at the same and

Optical fiber, describe the cnstruction of optical fiber

describe the cnstruction of optical fiber

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages