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1.
If you have completely polarized light of intensity 175
W
m²
through a polarizing filter with its axis at an 95 deg angle to the light's polarization direction?
1=
mW
m²
Y
what will its intensity be after passing

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b) Waveplates formed from accurate thicknesses of birefringent material may be used to change the polarisation state of light. For each of the following configurations of incident light (travelling horizontally), linear polarisers and waveplates, describe the polarisation state of the transmitted light: (i) Unpolarised light incident on a linear polariser with transmission axis vertical, followed by a half-wave plate with o and e axes at ±45 degrees to the vertical. (ii) As (i) above, but the half-wave plate is replaced by a quarter-wave plate at the same orientation (iii) As (i) above, but the linear polariser is rotated with axis at 30 degrees from the vertical, then the half-wave plate. (iv) As (i) above, but the half-wave plate is rotated with o axis vertical and e axis horizontal.
FM radio wave at 150 MHz travels along the x-axis with a magnetic field polarized along the z axis, width Bmax = 10^-4 T. The wave is reflected οn metal surface which intersects vertically the course of the wave at position x = 0. After reflection, the electric field changes phase by 180o but its width as well as its magnetic field remains the same. a) Write the expressions for the electric and the magnetic field of the incident and reflected EM wave. b) Calculate the parameters λ, β, ω, Ε max, the intensity and density of energy per unit volume of the EM field, as well as the force exerted by the EM radiation on surface if it has an area of 500 m^2. (c = 3x10^8 m/s, μ0, ε0 known).
The ratio If/lo is maximized when polarizer X is rotated so its polarization axis is 45° different from that of polarizer A (that is, when OAx is 45°). What is this maximum intensity ratio?
Vertically polarized light of intensity lo is incident on a polarizer whose transmission axis is at an angle of 70° with the vertical. If the intensity of the transmitted light is measured to be 0.34W/m², the intensity lo of the incident light is O 1.71 W/m2 O 0.99 W/m² O 0.43 W/m2 O 2.91 W/m²