Difraction occurs when a beam of ligth passses through a slit with width comparable to the wavelength. If you have N slits the  difraction pattern is the superposition of an interference pattern of N sources and the difraction pattern of a slit.  This program simulates the Fraunhofer difraction for some slits and it is posible to change slit parameters and the wavelength..
 
 
 

Instructions:

• The vertical scroll bar changes the incident wavelength in the visible range.
• The distance between the two  slits (a) is controlled with the left horizontal scroll bar.
• The width of each slit (b) is handled with the right horizontal scroll bar.
• You can choose, from the list, the number of slits (between 1 and 8).
• The button Acercar (zoom in) decreases the distance between the screen and the slits.
• The button Alejar  (zoom out) increases the distance between the screen and the slits.
• In order to go back to initial distance (predetermined) press the button Reset.
• At the left hand side appears the a and b values, wich are proportional to the slit separation and the width of the slit , respectively.