How to incress the brightness of screen bcz window 7 is installed in dell laptop

window 7 is install in dell laptop,and the problem is cratad that don't know the how to incress bightness 0f screen bcz no option show of brightness so please help
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More about incress brightness screen window installed dell laptop
  1. Dell laptop has default function key for controlling brightness. Press Fn(Function) Key+F5 for decreasing brighting & press Fn(Function) Key+F5 for increasing Brightness.
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