Question

What happens in the image intensification tube when magnification mode is activated?

1. the electron stream is further compressed
2. available input surface area being utilized is reduced
3. the electrostatic lens voltage is increased
4. electron crossover point moves further away from the input phosphor

Answer 1

When the magnification mode is activated in an image intensification tube, the electron crossover point moves further away from the input phosphor, resulting in higher magnification of the image.

Step-by-step explanation:

When the magnification mode is activated in an image intensification tube, the electron crossover point moves further away from the input phosphor. To understand this, let's first explain how an image intensification tube works. This device is used to amplify the incoming light and convert it into a brighter image. It consists of several components, including an input phosphor, microchannel plate, and an output phosphor.

When the magnification mode is activated, the electron beam passing through the microchannel plate is accelerated even further, which causes a greater acceleration in the electrons. As a result, the electrons are able to travel a longer distance before reaching the output phosphor. This increased distance between the input and output phosphor leads to higher magnification of the image. So, in the magnification mode, the electrons pass through the microchannel plate with a higher acceleration, allowing them to move further away from the input phosphor.