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Materials can handle the following arguments:

 

(n at 540 nm): this function returns the real part of the refractive index of the object at 540 nm. You can use alternative spectral units like 1/cm or eV if you like.

 

(k at 540 nm): this function returns the imaginary part of the refractive index of the object at 540 nm.

 

(alpha at 540 nm): this function returns the absorption coefficient (in 1/cm) of the object at 540 nm.