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in Physics by (95.2k points)

Regarding factors affecting the image: 

a. Curvature of the output screen causes a pin cushion effect 

b. S-type distortion is caused by the magnetic field influencing the path of electrons 

c. Images in intensifiers are magnified towards the centre 

d. The vignetting effect is reduced by curving the input screen 

e. Less electron focusing at the periphery causes less distortion at the peripheral parts of the image 

1 Answer

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a. False. Curvature of the input screen is responsible for the pin cushion effect. 

b. True. 

c. False. They are magnified towards the edges; this is called the pin cushion effect. 

d. True. 

e. False. Electrons are less focused at the periphery causing increased brightness and resolution in the centre and less distortion in the centre; these effects are more pronounced in a larger intensifier.

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