Just noticed when I switch off my portable CRT telly (Sharp; about 10 years old), there is a white area remaining on the middle of the screen glowing in the dark, which gradually disappears after about 5 minutes.
It is slightly spooky
but I am sure there is a scientific reason for it. What causes it and is it a fault?
It is slightly spooky
but I am sure there is a scientific reason for it. What causes it and is it a fault?