Lecture 2 Flashcards
Why must the l;ead glass screen be a conductor on one side?
To prevent the electrons from sticking to it
Why must the l;ead glass screen be a conductor on one side?
To prevent the electrons from sticking to it
How much can the lens temperature alter during operation?
How can we alter the focus of the beam?
Through a process called translation in which 2 coils are used to tilt the beam and then realign it
What is astigmatism?
When the lens is not perfectly spherical leading to different focal points for the vertical and horizontal planes.
How can astigmatism be corrected?
By adding another cylindrical lens at a perpindicular angle
What is the most important way to gain contrast?
Setting an aperture
How much can the lens temperature alter during operation?
How can we alter the focus of the beam?
Through a process called translation in which 2 coils are used to tilt the beam and then realign it
What is astigmatism?
When the lens is not perfectly spherical leading to different focal points for the vertical and horizontal planes.
How can astigmatism be corrected?
By adding another cylindrical lens at a perpindicular angle
What is the most important way to gain contrast?
Setting an aperture
