In a classroom demonstration, a beam of coherent light of wavelength 550 nm is incident perpendicularly onto a pair of slits. Each slit has a width w of 1.2 x 10 ^-6m and the distance d between the centers of the is 1.8 x 10 ^-5m. The class observes light and dark fringes on a screen that is a distance L of 2.2 m from the slits. Required:
a. Calculate the frequency of the light.
b. Calculate the distance between tow adjacent dark fringes on the screen.
c. what is the frequency of the light in the transparent fluid?
d. Does the distance between the dark fringes increase, decrease, or remain same? Explain your reasoning.