Wavelength of light inside an optical medium.

Returns the in-medium wavelength after accounting for the refractive index. Frequency (and photon energy) are unchanged; only the spatial period shortens.

Usage

wavelength_in_medium(lambda, n)

Arguments

lambda

Wavelength in vacuum or air (nm, or any consistent unit). Vectorised.

n

Refractive index of the medium (dimensionless). Must be >= 1.

Value

Wavelength in the medium, in the same unit as lambda.

Examples

wavelength_in_medium(500, n = 1.336)  # seawater: ~374 nm in medium
#> [1] 374.2515
wavelength_in_medium(c(400, 500, 600), n = 1.5)
#> [1] 266.6667 333.3333 400.0000