Unpolarized light of intensity 10 mW / m^2 is sent into a polarizing sheet as in Fig. 33-11. Wh

step 1 In this question, we have a polarizer and then we have unpolarized light of 10 milliwatt meter s

Unpolarized light of intensity 10 mW / m^2 is sent into a...

Unpolarized light of intensity $10 \mathrm{~mW} / \mathrm{m}^{2}$ is sent into a polarizing sheet as in Fig. $33-11$. What are (a) the amplitude of the electric field component of the transmitted light and (b) the radiation pressure on the sheet due to its absorbing some of the light?

Key Concepts

Electromagnetic Wave Intensity

This concept describes the relationship between the energy carried by an electromagnetic wave and the amplitude of its electric field. In classical electrodynamics, the intensity of a propagating electromagnetic wave is proportional to the square of its electric field amplitude. The mathematical form, often expressed as I = (1/2) c ?? E?² for a plane wave in free space, is fundamental when calculating energy transmission in optical systems.

Electric Field Amplitude

The amplitude of the electric field is a measure of the maximum value of the oscillating electric field in an electromagnetic wave. It is directly related to the energy of the wave, and thus to its intensity. Determining the amplitude is key in applications where the strength of the light–matter interaction is important, and it underpins many relationships in optics and photonics.

Polarization

Polarization refers to the orientation of the oscillating electric field vector of a light wave. When unpolarized light, which contains a random mixture of polarization states, passes through a polarizing filter, only the component of light aligned with the filter's axis is transmitted. This selective transmission reduces the total intensity of the emerging light and alters the effective amplitude of its electric field, a principle that is critical in both fundamental and applied optical technologies.

Radiation Pressure

Radiation pressure is the pressure exerted by electromagnetic radiation on surfaces as a result of the momentum carried by the light. When light is absorbed by a surface, its momentum is transferred to that surface, producing a measurable force per unit area. The concept is particularly important in studies of light–matter interactions and finds applications in systems ranging from solar sails in space propulsion to precise optical manipulation in laboratory settings.

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