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- What is the ratio between the electric current when the light intensity is 100% and when it is 50%?An unpolarized beam of light is sent into a stack of four polarizing sheets, oriented so that the angle between the polarizing directions of adjacent sheets is 30°.What fraction of the incident intensity is transmitted by the system?Find how much intensity of a beam of un-polarized light will go through three polarizers, where the first and second are rotated θ1=37º with respect to each other and the second and third are rotated θ2=30º with respect to each other.
- The electric field of a harmonic plane electromagnetic wave propagating in vacuum is given by (0 , 0 , 4)cos(3x-ωt) V/m; hence the corresponding magnetic field is:Consider an electromagnetic wave with a maximum magnetic field strength of 4.5 × 10-4 T. What is the maximum electric field strength in the wave in kV/m?A beam of polarized light is sent into a system of two polarizing sheets. Relative to the polarization direction of that incident light, the polarizing directions of the sheets are at angles u for the first sheet and 90° for the second sheet. If 0.10 of the incident intensity is transmitted by the two sheets, what is u?
- After passing through an analyzer, a beam of polarized light has an intensity of 1/10 of its initial intensity. Find the angle between the axis of the analyzer and the initial amplitude of the beam.If the magnetic field of a light wave oscillates parallel to a y axis and is given by By = Bm sin(kz- vt), (a) in what direction does the wave travel and (b) parallel to which axis does the associated electric field oscillate?Plane - polarized light is incident on a single polarizing disk, with the direction of E 0 parallel to the direction of the transmission axis. Through what angle should the disk be rotated so that the intensity in the transmitted beam is reduced by a factor of (a) 2.00, (b) 4.00, and (c) 6.00?
- An electromagnetic wave with a frequency of 4.72 x 1014 Hz has a speed of 1.71 x 108 m/s when it travels through a medium. What is the index of refraction of that medium?Prove, for a plane electromagnetic wave that is normally incident on a flat surface, that the radiation pressure on the surface is equal to the energy density in the incident beam. (This relation between pressure and energy density holds no matter what fraction of the incident energy is reflected.)How far does a beam of light travel in 1.30 ns?