Question

Can you make me understand the concept of refraction of light along with an example and a question?

Answer 1

In optics, refraction is a phenomenon that often occurs when waves travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media, the wave's phase velocity is altered, usually causing a change in direction. Its wavelength increases or decreases, but its frequency remains constant. For example, a light ray will refract as it enters and leaves glass, as there is a change in refractive index. A ray traveling along the normal (perpendicular to the boundary) will suffer change in speed, but not direction. Refraction still occurs in this case (by Snell's Law as angle of incidence will be 0°). Understanding of this concept led to the invention of lenses and the refracting telescope.

Example-anyone wearing eye glasses relies on light refraction in the lenses and light shining through a glass of water. The water refracts the light.