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

Illustrate briefly the significance of entropy, Illustrate briefly the sign...

Illustrate briefly the significance of entropy? Determine the work done when 2 mole of an ideal gas expands isothermally and reversible from 10 atm. To 2 atm. Pressure at 27 0 C

Differential equation for simple harmonic oscillator, Write down Seteps of ...

Write down Seteps of differential equation for simple harmonic oscillator subjected to a damping force proportional to periodic force of angular frequency ω and velocity of oscilla

Work and energy, if 2.13*106J of work must be done on a roller_coaster car ...

if 2.13*106J of work must be done on a roller_coaster car to move it 3.00*102m,how large is the net force acting on the car ?

Find resistance at boiling point of water, Q. The resistance of a nichrome ...

Q. The resistance of a nichrome wire at 0oC is 10 Ω. If the temperature coefficient of resistance is 0.004/ o C, find its resistance at boiling point of water. Comment on the resul

What are the majority carriers in p-type semiconductor, In p-type semicondu...

In p-type semiconductor the majority carriers are (A) Holes. (B) Positive ions. (c) Electrons. (D) Negative ions. Ans: In p-type semiconductor the majori

Which is equal to a newton, A Newton is equal to which of the following? ...

A Newton is equal to which of the following? a)  kilogram-meter per second b)  meter per second squared c)  Kilogram-meter per second squared d)  Kilogram per

Explain buoyancy in air, Explain Buoyancy in Air The same buoyancy happ...

Explain Buoyancy in Air The same buoyancy happens in air. This is how hot air balloons fly. By heating the air and lowering the density of the air in the balloon, the balloon f

Scalar aand vector quanties, two vectors 40N and 30N act at acute angle 3o ...

two vectors 40N and 30N act at acute angle 3o degrees to each other find the resultant vector using analytical method

Complementarity principle, Complementarity principle (N. Bohr) The prin...

Complementarity principle (N. Bohr) The principle which a given system cannot exhibit wave-like and particle-like both behaviors at the similar time. i.e., certain experiments

Third harmonic- standing waves on a string, Third Harmonic- Standing Waves ...

Third Harmonic- Standing Waves on a String There are a variety of patterns that could be generates through vibrations inside slinky, a string, or rope. Each pattern corresponds

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