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

Estimate the temperature of vapour pressure, The vapour pressure of a subst...

The vapour pressure of a substance at  20.0 o C is 38.1  kPa and its enthalpy of vaporisation is 49.6  kJ mol -1 . Estimate the temperature at which its vapour pressure is 80.0 k

Calculate the direction of the ball move - collision, A 77.0-kg woman is wa...

A 77.0-kg woman is walking 0.10 m/s east in the gym. A man throws a 15.0-kg ball south and accidentally hits the woman. The woman and the ball move together with a velocity

De-broglie wavelength, According to de-Broglie theory, the wavelength of de...

According to de-Broglie theory, the wavelength of de-Broglie wave is given by Where h = Plank's constant, m = Mass of the particle, v = Speed of the particle, E = Energy of

MOSFET, How do we experimentally know that MOSEFT device is working?

How do we experimentally know that MOSEFT device is working?

Rectangular coordinate system, A negative point charge of 10 -6 coulomb is...

A negative point charge of 10 -6 coulomb is located in air at the origin of a rectangular coordinate system. A second negative point charge of 10 -4 is situated on the positive x

Newton'' ring, why dark spot appears on newton''s ring?

why dark spot appears on newton''s ring?

Speed of light in vacuo, Speed of light (in vacuo); c The speed on whic...

Speed of light (in vacuo); c The speed on which electromagnetic radiation propagates within a vacuum; it is described as 299 792 458 m/s.

Voltage, Voltage: Voltage is the electrical equivalent of mechanical po...

Voltage: Voltage is the electrical equivalent of mechanical potential. If a person drops a rock from the first storey of a building, the velocity it will reach when dropped wi

Determine the voltage drop across the load, For the circuit shown in Figure...

For the circuit shown in Figure, calculate the current flowing in the 50Ω load and the voltage drop across the load when (a) XS is 3/5 of XY (b) point S coincides with point

Experiment of heater, Heater Another form of heater can be made from an...

Heater Another form of heater can be made from an old oil tin. Iron wire is wrapped round a test tube and twisted to form a handle.

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