Q. A broad beam of light of wavelength 642 nm is incident at 90° on a thin, wedge-shaped film with index of refraction 1.50. An observer intercepting the light transmitted by the film sees 17 bright and 16 dark fringes along the length of the film. By how much does the film thickness change over this length?
Q. A circular loop of wire of radius 12.5 cm is placed in a magnetic field directed perpendicular to the plane of the loop as shown in the figure below. If the field decreases at the rate of 0.027 0 T/s in some time interval, find the magnitude of the emf induced in the loop during this interval.