Light passes from one transparent medium into another. The light travels FASTER

in the FIRST medium. As the light crosses the boundary,

$($A$)$ Neither FREQUENCY nor WAVELENGTH changes.

$($B$)$ FREQUENCY stays the same, WAVELENGTH decreases.

$($C$)$ FREQUENCY stays the same, WAVELENGTH increases.

$($D$)$ FREQUENCY decreases, WAVELENGTH stays the same.

$($E$)$ Both FREQUENCY and WAVELENGTH increase