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

Determine the radius of curvature of glass sphere, A small air bubble is pl...

A small air bubble is placed 0.04 m inside a glass sphere of refractive index 1.5. When viewed normally from outside it is seen at a depth of 0.03 m. Determine the radius of curvat

Explain the types of x-rays, Depending upon the penetration power, there ar...

Depending upon the penetration power, there are two parts of X-rays Hard X-rays More penetration power More frequency of the order of ≈ 1019 Hz Lesser wavelength range

Describe bernoulli''s theorem, It describes that the total energy (pressure...

It describes that the total energy (pressure energy, potential energy and kinetic energy) of an incompressible and non-viscous fluid in steady flow by a pipe remains constant throu

Circular motions, Will an object spinning in zero gravity in vacuum continu...

Will an object spinning in zero gravity in vacuum continue spinning until an external force stops it?

Determine the axial force, Determine the axial force in the link AB of the ...

Determine the axial force in the link AB of the lifting tongs which cross without touching.  The weight of the crate is P44 kN and the width of the box is P45 mm   The axial for

Determine the supply voltage, The p.d.'s calculated across three resistors ...

The p.d.'s calculated across three resistors linked in series are 5V, 7V and 10V, and the supply current is 2A. Determine  (a) The supply voltage,  (b) The total circuit res

YDSE, Consider Young’s double slit experiment with a finite ...

Consider Young’s double slit experiment with a finite sized ( height 2b) source whose center point is symmetrically oriented about the mid

ELECTROSTATIC ., two insulated charged copper spheres A and B of identical ...

two insulated charged copper spheres A and B of identical size have charge q and -3q respectably .when they are brought in contact with each other and then separated,what are the n

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