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

What do you understand by absorption coefficient, What do you understand by...

What do you understand by "Absorption coefficient"? which is a better absorber of sound, glass or fibre glass?

Explain scattered electrons made strong diffraction pattern, Davisson and G...

Davisson and Germer scattered electrons from a crystal of nickel.  The scattered electrons formed a strong diffraction pattern. What important conclusion was drawn from this experi

Detremine the phase and line currents, Three coils each having resistance ...

Three coils each having resistance 3 Ω and inductive reactance 4Ω are linked (i) instar and (ii) in delta to a 415V, 3-phase supply. Calculate for each connection (a)

#speedvelocityacceleration, An object is thrown downward from a 150 cliff s...

An object is thrown downward from a 150 cliff so that it makes an angle of 30 with the horizontal. (a) How fast will it be going when it hits the ground? (b) How long will it take

Motion of a rigid body, Translational : If a body goes such that its orient...

Translational : If a body goes such that its orientation does not change with respect to time then body is said to move in translational motion. ROTATION : If an object is rota

Define why two parallel straight conductors carrying current, Derive a math...

Derive a mathematical expression for the force per unit length experienced by each of the two long current carrying conductors placed parallel to each other in air. Hence explain o

Write the equation of a current sine wave, Q. Write the equation of a 25 cy...

Q. Write the equation of a 25 cycle current sine wave having rms value of 30 A. Data:               ν = 25 Hz, Irms = 30 A Solution:         i = I o sin ωt   =

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