Concept:Refraction is the change in the direction of light when it travels from one transparent medium to another.
Explanation:When light passes from one medium to another, its speed changes, which causes its path to bend.
This bending or change in direction is called refraction.
Option B correctly states: "Change in direction of light when it passes from one medium to another."
Option A describes reflection, where light bounces back from a mirror.
Option C describes scattering, where light is deflected by air molecules or dust particles.
Option D describes dispersion, which is the splitting of white light into its seven colours.
The extent of bending depends on the refractive index:
n=vc, where
c is the speed of light in vacuum and
v is the speed in the medium.
According to Snell's Law:
n1sinθ1=n2sinθ2.
When light enters a denser medium, it bends towards the normal; when it enters a rarer medium, it bends away from the normal.
Answer:Option B: Change in direction of light when it passes from one medium to another.