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class Material(object):
"""Material optical properties."""
def __init__(self, name='none'):
self.name = name
self.wavelengths = None
self.refractive_index = None
self.absorption_length = None
self.scattering_length = None
class Surface(object):
"""Surface optical properties."""
def __init__(self, name='none'):
self.name = name
self.wavelength = None
air = Material('air')
h2o = Material('h2o')
glass = Material('glass')
vacuum = Material('vacuum')
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