Refraction of Light by 2E2 Chen Jing

!what do you learn about that particular topic?

I learn that the The bending of light that occurs when light passes from one transparent material to another is called refraction of light.light bends because its speed hanges as it moves from one transparent material to another.

light travels slower in more dense materials than in less dense materials.therefore light travels slower in glass than in air.

and i know many effects of refraction of light.such as we can use refraction of light to made the words appear to be nearer to the surface of the glass than they actually are.

From:textbook resource!

summarise the key points of that topic.
Refraction is the bending of light that takes place at a boundary between two materials having different indices of refraction.

Refraction is due to a change in the speed of light as it passes from one medium to another. The change in direction of the ray (represented by the heavy line in each diagram) is what is meant by the term refraction, which just means ¡°bending¡± or ¡°breaking.¡±

From:http://mintaka.sdsu.edu/GF/explain/optics/refr.html!

anything interesting to add?I

n 1621, a Dutch physicist named Willebrord Snell (1591-1626), derived the relationship between the different angles of light as it passes from one transperent medium to another.

When light passes from one transparent medium to another, it bends according to Snell's law which states:Ni * Sin(Ai) = Nr * Sin(Ar),

where:Ni is the refractive index of the medium the light is leaving,Ai is the incident angle between the light ray and the normal to the meduim to medium interface,Nr is the refractive index of the medium the light is entering,Ar is the refractive angle between the light ray and the normal to the meduim to medium interface.

From:http://www.ps.missouri.edu/rickspage/refract/refraction.html