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

Important parts of an ac dynamo, 1)The armature ABCD consists of a copper w...

1)The armature ABCD consists of a copper wire wound on cylindrical soft-iron core.The armature can be rotated horizontal axis perpendicular to magnetic field. 2)NS is permanent

Write the expression for the equivalent focal length, Write down the expres...

Write down the expression for the equivalent focal length of two thin lenses separated by a distance and illustrate the terms.

Explain process of carnot cycle, Explain process of Carnot cycle Carnot...

Explain process of Carnot cycle Carnot cycle having of two adiabatic and two isothermal processes, all are reversible. To explain the carnot cycle, suppose the working substanc

Define sound waves, The energy to which the human ears are sensitive is nam...

The energy to which the human ears are sensitive is named as sound. In general all parts of waves are produced in an elastic material phase, Irrespective of while these are listen

What do you mean by dispersion, What do you mean by dispersion? Describe a ...

What do you mean by dispersion? Describe a physical quantity which depends only on the material of the prism for its dispersion. Get an expression for it.

Hubble constant, Hubble constant; H0 (E.P. Hubble; 1925): The constant...

Hubble constant; H0 (E.P. Hubble; 1925): The constant that determines the relationship among the distance to a galaxy and its velocity of recession because of the expansion of

What is fine structure of spectral lines, Q. What is fine structure of spec...

Q. What is fine structure of spectral lines? When the spectral line of hydrogen atom is observed by spectrometers having high resolving power it is found that a single line is

What is half wave plate, What is half wave plate? Explain its action o...

What is half wave plate? Explain its action on polarized light incident on it with its electric vector E making an angle with the optic axis of the half wave plate.

Need neuroscience assignment help, Neuroscience is a scientific study of t...

Neuroscience is a scientific study of the nervous system. Usually, neuroscience has been seen considered as a branch of biology. Thus, it is now present an interdisciplinary scien

Explain the construction of gamma camera, Question 1. Discuss the physi...

Question 1. Discuss the physical characteristics of an X-ray beam. Write a note on factors influencing the quality and intensity of the X-ray beam 2. Explain the constructio

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