Question Responses:

A.  As the slit width increases, the difference in the minima and maxima increases as well.

B.  When comparing single and double slits, the double slit tends to create more lines than dots, which is seen by the single slit.  Also, as the width of the double slits increase, the intensity of the light appears to decrease along with the length of the line segments.

C.  Using a multi-slip gradient is better for accurate measuring because it better separates the minima and maxima of the laser light.

     If you were to change the distance of the gradient from the source, as the distance increases, the maxima move closer together.