UV transmission of sunglasses

[Physikfan]

The spectra are photos of Hg spectra with constant exposure time, light source is a Hg high-pressure lamp, the entrance slit is imaged with a quartz lens via a reflection grating on a screen, to detect the UV lines, the left part of the screen is coated with an ultraviolet luminous color.

The first picture is the Hg reference spectrum, the lines go deep into the UV.


The second picture shows the Hg spectrum, filtered by cheap sunglasses.
The color of the blue line in the spectrum of the sunglasses also corresponds to the color of the visual impression with unarmed eye.
The color of the violet line in the Hg reflectance spectrum does NOT match the color of the visual impression with unarmed eye, and is an artifact, probably due to overexposure at this point.
To my surprise, the quality of the sunglasses is excellent in terms of UV protection,
I will now use these glasses as goggles for my further UV experiments.
UV experiments with normal glasses are in preparation.