Red is a primary color, you can't mix 2 to get red. Blue is primary, too, and so is yellow. You can mix any of the above colors to make another color. ie: red and yellow make orange. red and blue make purple. blue and yellow make green. yellow and green make light green. white and red make pink.
Difference between Optical Mouse and Laser Mouse. Key Difference: The optical mouse uses a light-emitting diode, while a laser mouse uses a laser in order to detect movement. A mouse is hardware that is required when trying to navigate on a desktop PC. However, many people these days also use a mouse on their laptops as it makes navigation easier.
It corresponds to Pixels on a computer screen, but usually there are 4 times more dots per inch on a print, than pixels per inch on your monitor. See fuller explanation at http://wiki.answers.com/Q/What_does_pixel_stand_for_in_digital_photography DPI can also refer to the sensitivity of an optical or laser mouse.o that said, if you use a 1024x786 screen resolution, using a 1000DPI mouse, it would 'technically' take 1 inch to move from one side to the other. But it also relates to how many 'screen shots' the mouse takes per second.