Question

difference between electron lenses and electrostatic lenses

Answer 1

$hi..$
Electrostatic lenses :

An electrostatic lens is a device that assists in the transport of charged particles .
For instance, it can guide electrons emitted from a sample to an electron analyzer, analogous to the way an optical lens assists in the transport of light in an optical instrument.
Systems of electrostatic lenses can be designed in the same way as optical lenses, so electrostatic lenses easily magnify or converge the electron trajectories.
An electrostatic lens can also be used to focus an ion beam, for example to make a microbeam for irradiating individual cells.

Electron Lenses :

Electron optics is a mathematical framework for the calculation of particle paths along given electrostatic or magnetostatic fields.
The term optics is used because a charged particle beam can be manipulated using magnetic or electrostatic lenses in a similar fashion to the manipulation of a light beam with optical lenses.
Electron optics calculations are, besides other uses, needed for electron microscopes and are also crucial for the design of modern particle accelerators. In paraxial approximation, the calculations can be done using ray transfer matrix analysis.

$hope \: \: \: this \: \: \: helps..$

Answer 2

Answer:

Electrostatic focusing is preferred over magnetic focusing because it is not affected very much by changes in the line voltage and needs no ion-spot correction.The electrons that get accelerated under the influence of the high voltage anode area, attain v e ry high velocities before they hit the screen.