Chapter 12, Problem 29P

A Jamin interferometer is a device for measuring or for comparing the indices of refraction of gases. A beam of monochromatic light is split into two parts, each of which is directed along the axis of a separate cylindrical tube before being recombined into a single beam that is viewed through a telescope. Suppose we are given the following, • Length of each tube is L = 0.4 m. • λ= 598 nm. Both tubes are initially evacuated, and constructive interference is observed in the center of the field of view. As air is slowly let into one of the tubes, the central field of view changes dark and back to bright a total of 198 times. (a) What is the index of refraction for air? (b) If the fringes can be counted to ±0.25 fringe, where one fringe is equivalent to one complete cycle of intensity variation at the center of the field of view, to what accuracy can the index of refraction of air be determined by this experiment?

1. An arrangement of three charges is shown below where q₁ = 1.6 × 10-19 C, q2 = -1.6×10-19 C, and q3 3.2 x 10-19 C. 2 cm Y 93 92 91 X 3 cm (a) Calculate the magnitude and direction of the net force on q₁. (b) Sketch the direction of the forces on qi

(Figure 1)In each case let w be the weight of the suspended crate full of priceless art objects. The strut is uniform and also has weight w  Find the direction of the force exerted on the strut by the pivot in the arrangement (a). Express your answer in degrees. Find the tension Tb in the cable in the arrangement (b). Express your answer in terms of w. Find the magnitude of the force exerted on the strut by the pivot in the arrangement (b). Express your answer in terms of w.