Irradiance of light after polarizer
===================================

**Malus's law** states that the irradiance of linearly polarized light that passes through a polarizer
is proportional to its initial intensity, transparency coefficient of the polarizer and square cosine
of the angle phi between the light's initial polarization direction and the axis of the polarizer.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Polarizer#Malus'_law_and_other_properties>`__.

.. py:currentmodule:: symplyphysics.laws.optics.irradiance_of_light_after_polarizer

.. py:data:: irradiance_after

    Light :attr:`~symplyphysics.symbols.astronomy.irradiance` after passing through the polarizer.

Symbol:
    :code:`E_e`

Latex:
    :math:`E_\text{e}`

Dimension:
    :code:`power/area`


.. py:data:: irradiance_before

    Light :attr:`~symplyphysics.symbols.astronomy.irradiance` befor passing through the polarizer.

Symbol:
    :code:`E_e0`

Latex:
    :math:`E_{\text{e}0}`

Dimension:
    :code:`power/area`


.. py:data:: transparency_coefficient

    :attr:`~symplyphysics.symbols.optics.transparency_coefficient` of the polarizer.

Symbol:
    :code:`k`

Latex:
    :math:`k`

Dimension:
    :code:`dimensionless`


.. py:data:: polarization_angle

    Polarization :attr:`~symplyphysics.symbols.basic.angle`.

Symbol:
    :code:`phi`

Latex:
    :math:`\varphi`

Dimension:
    :code:`angle`


.. py:data:: law

    :code:`E_e = E_e0 * k * cos(phi)^2`


    Latex:
        .. math::
            E_\text{e} = E_{\text{e}0} k \cos^{2}{\left(\varphi \right)}