Ques : What is DPI ?

 DPJ (Dop Per Inch) ie a measure for th~ actual sharpness of the onscre: a image. This depends on bath the resolution and the size of the image. Pyactica1,expeyjence shows that a smaller screen has a sharper image at the same resolution than does a larger screen. This is because it will require more dots per inch to display the same number of pixels. A 15-invh monitor is 12-inches horizontally. 4 10-inch'monitor is 8 inches horizontally. To display a VGA image (640U480) the 15-inch monitor will require 53DPI and the 10-inch monitor