Optical path length from geometrical path length and refractive index
=====================================================================

*Geometrical path length* is the Euclidean distance integrated along a light ray
between any two points.

**Conditions:**

#. The environment must be homogeneous.

**Links:**

#. `Wikipedia, first formula <https://en.wikipedia.org/wiki/Optical_path_length#>`__.

.. py:currentmodule:: symplyphysics.laws.optics.optical_path_length_from_geometrical_path_length_and_refractive_index

.. py:data:: optical_path

    Optical path length of the light ray. See :attr:`~symplyphysics.symbols.optics.optical_distance`.

Symbol:
    :code:`Lambda`

Latex:
    :math:`\Lambda`

Dimension:
    :code:`length`


.. py:data:: geometrical_path

    Geometrical path length of the light ray. See :attr:`~symplyphysics.symbols.classical_mechanics.distance`.

Symbol:
    :code:`s`

Latex:
    :math:`s`

Dimension:
    :code:`length`


.. py:data:: refractive_index

    :attr:`~symplyphysics.symbols.optics.relative_refractive_index` of the medium.

Symbol:
    :code:`n`

Latex:
    :math:`n`

Dimension:
    :code:`dimensionless`


.. py:data:: law

    :code:`Lambda = n * s`


    Latex:
        .. math::
            \Lambda = n s