When light passes from one medium to another there is a change in its direction, this phenomenon is called ________.
Refraction
When light passes from one transparent medium to another, its speed changes (because the refractive indices differ). This change in speed at the boundary causes the ray to bend — a phenomenon called refraction, governed by Snell's law.
Diffraction is the bending of waves around obstacles or through narrow slits, not at a media boundary. Propagation simply means the transmission of light through a medium and does not involve a directional change. Hence the correct answer is Refraction.
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