Refraction occurs when light passing from one medium to another. true or false

True

Refraction is a phenomenon in which the light bends or changes its direction (and changes the speed of propagation, as well) when passing through a medium with a refractive index different from the other medium.  

Where the Refractive index is a number that describes how fast light propagates through a medium or material:

Being a relation between the speed of light in vacuum  and its speed in the other medium .

It is important to note that in this process, the wavelength may be modified because it depends on the medium, however, the refracted ray of light does not change its frequency.

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