Explain astigmatism, Physics

Assignment Help:

Astigmatism:

In this defect the surface of eye is not perfectly spherical. The eye has different focal point in dissimilar planes and image of an object is not focused clearly on the retina.

Correction:

Astigmatism is corrected by asymmetrical lenses which have dissimilar radii of curvature in dissimilar plane.

 


Related Discussions:- Explain astigmatism

Anekardhi shabdh, list of anekardhi shabdh with examples

list of anekardhi shabdh with examples

State maxwell''s right hand cork screw rule, Q. State Maxwell's right hand ...

Q. State Maxwell's right hand cork screw rule. Maxwells's right hand cork screw rule: If a right handed cork screw is turn to advance along the direction of the curren

Copernican principle , Copernican principle (N. Copernicus) The idea, ...

Copernican principle (N. Copernicus) The idea, recommended by Copernicus, that the Sun, not the Earth, is at the middle of the Universe. Now we know that neither idea is accur

Experiment on thermo electric thermometers, what are the advantages of usi...

what are the advantages of using the thermo-electric thermometer over the mecury glass thermometer?

MODERN OPTICS, DERIVATION OF ANGLE OF DEVITAION

DERIVATION OF ANGLE OF DEVITAION

PVD, In order to deposit films of the alloy YBa2Cu3, the metals Y, Ba, and ...

In order to deposit films of the alloy YBa2Cu3, the metals Y, Ba, and Cu are evaporated from three point sources. The latter are situated at the corners of an equilateral triangle

Principle of cell , Principle of Cell: To study electrical principles ...

Principle of Cell: To study electrical principles further we require a source of emf. Although an emf can be produced by any of the six methods discussed above, large amounts o

Determine the value and tolerance of a resistor, Verify the value and toler...

Verify the value and tolerance of a resistor having a colour coding of: blue-grey-orange- red Determine the value and tolerance of a resistor having a colour coding of: yellow-

Define Displacement: , Displacement: - The modification in position of a bo...

Displacement: - The modification in position of a body in a certain direction is known as displacement. It is a vector function and its unit in SI system is meter.

Motion, a rocket is projected upwards with a velocity of 490. find te time ...

a rocket is projected upwards with a velocity of 490. find te time taken to reach the ground

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd