Investigating Snells Law

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Investigating Snell’s Law
Research Question:
The effect that the angle of incidence of white light has on the angle of refraction from one transparent medium to another.
Introduction:
Snell’s law state: When light passes from one transparent medium to another the rays of light refract (bend).
Snell’s law (Law of Refraction) states that: n*=sinⅈsinr=n2n1=V1V2 for the purpose of this experiment we will be proving that: sinⅈsinr=n2n1 or n1sinⅈ=n2sinr where n1 and i are the index of refraction and angle with the normal to the surface for the incident ray, respectively, and n2 and r are for the refracted ray.
Aim:
The aim of this investigation is to prove determine the relative refractive index of perspects.
Hypothesis:
Sin i / Sin r will produce a constant ratio – the refractive index for perspects
Variables:
Independent Variable: Sine of the angle of incidence (Sin i)
Dependent Variable: Sine of the angle of refraction (Sin r)\
Controlled Variables: The light source was kept constant, the same block of perspects was used.
Uncontrolled Variables: Not relevant
Apparatus:
* Ruler, Protractor, Incandescent Light Source
Procedure:
Given on the assignment sheet (Investigating Refraction: Snell’s Law)

Results: Raw Data | Processed Data | Trial # | Angle of Incidence (°) | Angle of Refraction (°) | Sin i | Sin r | Sin i/Sin r | 1 | 53 | 33 | 0.798 | 0.546 | 1.462 | 2 | 41 | 27 | 0.656 | 0.454 | 1.445 | 3 | 31 | 21 | 0.515 | 0.358 | 1.439 | 4 | 29 | 20 | 0.485 | 0.342 | 1.418 | 5 | 10 | 8 | 0.174 | 0.139 | 1.252 |

Discussion:
Although it appears there are no major outliers on this graph when the slope is taken of Sin i/Sin r the first point on the graph gives a slope of 1.252, opposed to the other results of approximately 1.44.
These results show that the relative refractive index of Perspex is equal to 1.441 (slope of…...

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