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# To find the refractive index of light in different materials.

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Introduction

TILLE :what are the refractive indexes of light in different material? AIM : To find the refractive index of light in different materials. APPARATUS : Ruler Protractor Plain paper Ray box Perspex block Water Container Glass block DIAGRAM BACKGROUND INFORMATION When a light ray travels from air into a clear material such as glass or water, you can see the ray change direction. This is called refraction. Refraction happens because light travels faster in the air than in other substances. The amount by which a light ray bends when it goes from air into another material depends on two things : (a) what the material is (b) The angle of incidence The angle of incidence is the size of the angles between the ray before it enters the substance and the normal. ...read more.

Middle

Analysis From the result that I had gathered, the relatice index can be found the sin of incidence devided by the sin of refraction between two material. The incident and refracted rays are on opposite sides of the normal at the point of incidence and all three are in the same place. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. The result had shown that the water had the lowest refractive index which is 1.06 and the glass had the highest which is 1.53 .This could be propotional to the density of the material because glass has the largest density and the water had the lowest. ...read more.

Conclusion

More different kind of other materials could have been perfomed to see if density affects the reflactive index. The graph shows many irregular results in each material, which are not near the best-fit-line. These would have been a result because inaccurate reading of the protractor may given irregular results, the normal may not have been drawn accurately at 90 degree to the template of the glass block, in some material, some angles gave more than one ray on the other side, and the wrong ray might have been used. For example the water experiment, there were rays given off from the water, the plastic container and also the ray that passed over the container and the light ray from the ray box was difficult to use ...read more.

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