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## Homework Statement

I have to find out a relationship between the deflection of an electron beam in a cathode ray tube and the accelerating voltage.

## Homework Equations

I know that theoretically D is inversely proportional to the accelerating voltage.

## The Attempt at a Solution

I have to do this experimentally and they are giving me data tables. To find out the deflection (D) they give me:

Accelerating Voltage: 400 V

First Position: 5.00 cm

Second Position: 9.00 cm

To find out the deflection (D), they tell me to subtract the two positions and divide by 2. I don't understand what first position and second position refer to. Why do I need to divide by 2? I actually don't know how a cathode ray tube works and why would it provide 2 different positions for the same accelerating voltage.

I don't know if I provided enough details, but any suggestions or ideas are greatly appreciated.