i built a laser in my lab... it consists of one Ne-He tube with a concave mirror at one end and a window at the other end. i just put another mirror infront of tube's window to get the laser. i got one question i cant find an answer to, the lab's guide said the intensity of the laser depends on the distance of the two mirrors. and i cant see why, i mean, the only reason i can find is that for some positions more light is being reflected back and forth between the mirrors so the laser is more powerful (but thats position, not distance.. and i always re-tune the mirror so it will produce the most powerful laser for that distance), and for some distances theres not enough light reflecting between them so no lasering effect is present. but apart from that... is there anything im missing? i mean im supposed to have a fit to the graph, and no function apart from heaviside comes to mind.