- Refraction is the phenomenon of light bending when it travels from one medium to another medium.
- Refraction occurs because the velocity of light changes when it travels from a medium into another medium.
The law of refraction states that:
- The incident and refracted rays are on opposite sides of the normal at the point of incidence and all three are in the same plane.
- The ration of sin i / sin r is a constant. This constant is called refractive index.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIINaTNurjlUOVpWtvAB9OAkIr6OQcOhGERCnW3sAPTB9FKmGbd5ri3XGA86FPCqOzszurCBKMccGAt4xkZHWqrxuDXUYCcdBKQ0VUm8w_fFu_S-cjcYbSviaIfynug1jQYc4Kt7r5qWo/s1600/250px-Refraction_and_Reflection.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleiG_xtyPqKvNQslemG8OlU6LEKOlUlUY4n0uSUUYgLbwT4JzNY7V1tsynrEUWKQVxQcUse8n7x7V5bHgZmeyPq8Q8vuitM_NQGK363r4bjA_pL2CvCxw_3r6RuPBzALMVGUED-vQ4II/s400/air-water.png)
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