# Light reflection and refractio

December 20, 2016 Law

The following paper is on the chapter of light reflection and refraction. The law of refraction states that when a light ray strikes a reflecting surface, the angle of reflection is equal to the angle of incidence. The angle of incidence and the angle of reflection are measured from a normal that is perpendicular to the angle of incidence. Reflected rays are scattered in different directions depending on the surface reflected on. A diffuse reflection is a reflection of light into many directions by a rough surface.

An example of this would be: paint on a wall has a rough surface which will scatter the light rays that are reflected onto it in different directions. Another Type of reflection is a regular reflection. This is a reflection of light where both of the light rays follow the law of reflection and are parallel to each other. The next section in the chapter is on the refraction of light. When light is introduced into different environments or mediums, light will travel at different speeds and in different directions.

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If light travels faster through one medium than another than the medium that the light travels through sloweris considered to be optically dense. Refraction is the/a change in direction or bending of light at the border between two mediums. Now, refraction only occurs when the ray of incident hits a boundary between the two media at a non-zero angle. Light is refracted toward the normal when it passes to a denser medium, and light is refracted away from the normal when the light ray passes into a medium that is l;ess dense. The next section is on Snell's Law.

The law states that a ray of light bends in such a way that the ration of the sine of the angle of incidence to the sine of the angle of refraction is constant. This law came from the Dutch scientist Willebrord Snell, who discovered the relationship between the angle of incidence and the angle of refraction. This relationship is that if the angle of incidence increases, the angle of refraction increases. The equation is as follows: n=sin0i sin 0r where 0i= angle of incidence, 0r= angle of reflection, and n= the index of refraction of the medium. The final section of the chapter is on the index of refraction and speed of light.

The index of refraction is the ratio of the speed of light in a vacuum to its speed in a material. Refraction occurs because the speed of light depends on the medium through which it travels. The index of refraction is the measure of the amount that light bends when passing from a vacuum into a medium. The rays are refracted toward the normal. The equation is as follows: Ns=c/Vs, where Ns= index of refraction, Vs= speed of light, and c is the speed of light in a vacuum. Speed of light is calculated with the equation Vs=c/Ns. That concludes the end of this report on Light Reflection and Refraction.

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