Measure the distance between the sources, and the path distance from each of the sources to the nodal point shown on the diagram. Show the complete calculation for wavelength. Measure the path distances from each of the sources to the anti-nodal point shown on the diagram. Using measurements from part (i) for the distance between sources and the measurements made in part (ii), show the complete calculation for the wavelength. What effect would an increase in frequency have on the interference pattern?

Please explain your answer in 1, 2 and 3 thank you.

consider the effect of the spacing between the slits in the grating. What happens when you increase the number of slits per millimeter and decrease? and why do we see these results? Explain in terms of the interference between light wavespassing through the grating

A. It appears that there should be a bright fringe at the location of point D. Why isn’tthere? Explain The previous figure is also labeled with points A and B which are at the locations of maximaand points C and D which are at the locations of minimum  For Questions b and c below,you will need to discuss whether each of those minima/maxima stays at the same location,moves to the left or moves to the right and then explain your answers for each B. The slit width is slightly decreased C. The slit separation is slightly decreased.