d=3a. The wavelength of the monochromatic light incident upon the slits is 1= 2a/3 (in air). The lower slit is covered with a transparent film of thickness a/2 and index of refraction n = 1.80 (you can take nair as 1.00). This film also reduces the amplitude of the electromagnetic wave passing through it by half. (a) What is the change in phase introduced by the film for the wave passing through it? (b) What is the expression for the phase difference between the waves frm the two slots, as a function of O? (c) Where is the central maximum of the interference pattern, i.e., what is the value of 6 where m = 0? (Hint: Use the result above.)

The diagram below illustrates the phenomenon of "missing orders" in the interference pattern made by a double slit. Some orders are missing (that is, there should be a bright fringe but there isn't) because: "Missing orders" Select one: a. Light reaching the screen that passes through different parts of each slit interferes destructively, even though light from the two slits interferes constructively O b. Light reaching the screen from the two slits interferes destructively, even though light that passes through different parts of each slit interferes constructively

Keeping the slit width and screen distance constant, how does the light colour such as blue, red and green affects the fringe spacing. Briefly explain your answers in words

Based on the pattern observed on the screen, calculate the width D of the slits.   Based on the pattern observed on the screen, calculate the distance d between slits.   What would happen to the pattern on the screen if you immersed the entire apparatus (laser, slit, and screen) underwater (n = 1.33)? (choose circle only one) A) The pattern would spread out (become broader).B) The pattern would become narrower.C) The pattern would not change.