Light ia different wave length in different medium?

[Lostintime]

When a wave passes into a different medium, its frequency is the same.
But its speed changes

According to c=lamda x f
Wavelength of the light should change

Does this mean light is 400-700nm only in air? Or a vaccum?

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[milski]

The difference between air and vacuum is really minimal. The 400nm-700nm is valid for both.

You are correct that in certain media what we technically consider light will have a different wavelengths, say 450-750 nm.