Agrating with 600 lines/mm is placed in a monochromator, with exit slits which are 75 cm away. what is the spectral width of the exit slits if they are physically 5 micrometers wide? 100 micrometers wide?

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.