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

Periodic table, true or false. All radioactive elements have been synthesiz...

true or false. All radioactive elements have been synthesized

Find the atomic number and the mass number, Q. The radioactive isotope 84Pa...

Q. The radioactive isotope 84Pa214 undergoes a successive disintegration of two α decays and two β decays. Find the atomic number and the mass number of the resulting isotope.

Deuterium and tritium, Why is it easy to fuse hydrogen isotopes deuterium a...

Why is it easy to fuse hydrogen isotopes deuterium and tritium than ordinary hydrogen?

Show the categorization of alloys, Q. Show the Categorization of Alloys? ...

Q. Show the Categorization of Alloys? Alloys are able to be classified by the number of their constituents. An alloy with two components is described as a binary alloy and one

Determine the primary current and power factor, A single-phase transformer ...

A single-phase transformer has 2000 turns on the primary and 800 turns on the secondary. Its no-load current is 5A at a power factor of 0.20 lagging. Assuming the volt drop

Curie point, It describes the temperature above which the material loses it...

It describes the temperature above which the material loses its spontaneous polarization and piezoelectric characteristics.

What is the significance of poynting vector, Write down the differential fo...

Write down the differential form of Poynting theorem. What is the significance of Poynting vector?

Various types of fixed- value resistors , Th e fixed value resistors are t...

Th e fixed value resistors are those whose resistance are fixed and cannot be changed. The fixed resistors can be further subdivided into following categories. (a)

Find the normal force, The mass of an automobile is 1140kg, and the distanc...

The mass of an automobile is 1140kg, and the distance between its front and rear axles is2.48 m. The center of gravity of theca is between the front and rear tires, and the horizon

Electromagnetic radiation , a)      You are travelling in a rocket in a tot...

a)      You are travelling in a rocket in a totally vacant universe. The rocket is travelling at 100 m.s -1 and accelerates at 10g for 3 minutes. How fast are you travelling at th

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