Listed below are alterations made, one at a time, to the original experiment, and the experiment is repeated. After each alteration, the experiment is returned to its original configuration. Which of these alterations decreases the angles at which the diffraction minima appear? a. The slit width is doubled
b. The slit width is halved
c. The experiment is conducted in a water-filled tank.
d. The distance between the slits and the screen is doubled
e. The distance between the slits and the screen is halved
f. A green, rather than red, light source is used