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.
While older mice use a small ball on the bottom to control the cursor, newer ones use a laser. Some computer mice instead have a large ball on top of the mouse so that instead of moving the mouse across a surface to interact with the computer, the user keeps the mouse stationary and instead moves the ball.