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How do I scroll page with mouse?
To move up or down through the pages on a screen, move your mouse cursor over to the scroll bar on the right-hand side. Click on and hold the scroll bar thumb and then move your mouse forward or back over the mouse mat to move up or down on the screen.
How does optical mouse scroll wheel work?
Each wheel is made up of plastic spokes and, as it turns, the spokes repeatedly break a light beam. The more the wheel turns, the more times the beam is broken. So counting the number of times the beam is broken is a way of precisely measuring how far the wheel has turned and how far you've pushed the mouse.
