Color vision and chromatic aberration:, Physics

Color vision and chromatic aberration:

One of the remarkable ability of the eye is its ability to see color.

There are three types of cones that respond to light from three different parts of the spectrum .
-    Images on a color TV screen are produce by a method similar in some aspects.
-    If you examine a color TV screen with a magnifying glass , you will see a myriad of small red ,green ,and blue dots .These dots can produce in different  combinations all of the colors of the spectrum.
-    If is thought that in an analogueway ,signals are sent to the brain from three colored cones in different combinations permitting it to determine color.
-    If one color sets is gone , a person is color blind – he confuses certain colors
-    Approximately 8% of all man and 0.5% of all women are color blind .

Chromatic aberration :

Is a common lens defect caused by the change of the index of refraction with wavelength.(This permits a prism to separate white light into a rainbow of colors).

-    Chromatic aberration causes different colors to come to a focus at different distance.
-    Chromatic aberration is greatly reduced in an expensive camera because a lens is used that made of several types of glass chosen to compensate for the change of the index of refraction with wavelength .

Purkinje effect:

A special color effect that is sometimes noticeable at dusk,Purkinje noticed that at dusk the blue blossoms on his flowers appeared more brilliant than the red blossoms.

-    This effect is caused by the shift of the best sensitivity of the eyes toward the blue as the rods take over from the cones at two light levels.
-    Since the eyes and corrective lenses are optimized for yellow light ,this shift toward the blue produces a refractive error of about 1.0 D, in  other words ,for night vision you should wear a glasses with an additional 1.0 D.

Posted Date: 10/1/2012 9:11:12 AM | Location : United States

Related Discussions:- Color vision and chromatic aberration:, Assignment Help, Ask Question on Color vision and chromatic aberration:, Get Answer, Expert's Help, Color vision and chromatic aberration: Discussions

Write discussion on Color vision and chromatic aberration:
Your posts are moderated
Related Questions
Consider the 2D shape below. Draw a possible configuration of nodes and cells (at least 15) that could be used to solve for the temperature distribution. Provide equations that wou

Helium gas with a volume of 2.60 L, under a pressure of 1.30atm and at a temperature of 41.0 degrees, is warmed until both pressure and volume are doubled. a)What is the final temp

Rotating a Mirror and the Reflected Ray Describing in which when a mirror is rotated through an angle, the reflected ray is rotated through twice that angle. You might drag th

For the magnetic circuit shown in Figure find the current I in the coil needed to produce a flux of 0.45mWb in the air gap. The silicon iron magnetic circuit has a uniform cros

The Diamond Structure The diamond cubic structure is a distinctive of materials that have its constituent materials  bound in tetrahedral bonds. Insulators like carbon, semicon

Explain newtons cradle- A typical Newton's cradle consists of metal balls of identically sized in a series suspended in a metal frame ,so that they are just touching each other at

Voltmeter: An electromechanical instrument which is used to calculate potential difference among two points is known as voltmeter. Voltmeter is a modified form of a galvanom

Describe concept about vibrational modes of carbon dioxide molecule. Vibrational Modes of CO 2 molecule While excited, the CO 2 molecule vibrates as masses joined by a spr

Define Rocket in Drag (Princeton)? A rocket has an effectual frontal area A and blasts off with a constant acceleration a straight up from the surface of the Earth. a)