In one of the labs, a pair of students aims a laser at a diffraction grating. From the pattern that was projected on the screen as well as the slit spacing and the distance between the grating and the screen, they can determine O (d) the wavelength of the laser light O (c) the angle of incidence equal the angle of reflection O (f) the transmission coeffcient of the grating O (a) the slit width O (e) the angle of divergence of the laser beam O (b) the index of refraction of the gratingFor a given measurement, the theoretical value is 100 mV and the experimental value is 50 mV. What is the discrepancy? O (e) 100% O (a) 10% O (c) 50% O (f) 50 mV (b) 25% O (d) 75%How does the flux of light from an isotropic source depend on the distance r from the source? O (f) None of the choices provided. O (e) No dependence on r O (c) 1/ (rxr) O (d) r O ( b ) rxr O (a) 1/r