When the speed of light in the two media is not the same.
light
Refraction
Refraction
reFRACtion There isn't a good nmeonic or the like to remember the difference between refraction, reflection and diffraction. You just have to learn it.
In reflection the light bounces bach; in refraction the light passes through, but is bent at the interface.
In a sense, light does not bend. Light sometimes passes through space (or space-time) that is warped or bent because of a nearby object having very strong gravity. The light passes through this space in what (from the light's point of view) is a straight line. To other observers the light may appear to have followed a bent path. So gravity warps space-time, and light appears to bend as it travels through this warped space-time. The light isn't doing anything except following what is a completely natural path through space.
Refraction, when the light passes through matter and is bent, or reflection, when the light bounces off.
angle at which light is bent when it passes through an object... not sure of the exact equation, i think it has something to do with theta and sine or cosine... someone else help?
Light passes through a lens, typically being bent by refraction. Light reflects off a mirror.
" The light is bent by refraction, caused by the medium through which it passes"
BENT
when light enters the eye it passes through the cornea then pupil then the lens where it is bent and focused on the retina