Diff Frequency

when light goes from one medium to another w/diff refraction what happens?
When light goes from one medium to another medium with a different index of refraction, which of the following do (does) not change?
the speed
the frequency
the wavelength
the speed and the wavelength
the frequency and the wavelength
the speed-(do change)in the denser medium is smaller than in less dense medium
the frequency-remain constant/unchanged
the wavelength-(do change)in the denser medium is shorter
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