refractive index prac report

... Refractive Index Prac Report Aim: To find the refractive index of the Perspex block Hypothesis: The refractive index of the Perspex block should be grater than the refractive index of Air. Introduction: Snell's law states that the refractive index of a substance multiplied by Sin of the angle or incidence should be equal to the refractive index of another substance multiplied by Sin of the angle of refraction. The mathematical equation that describes this relationship is: Independent Variable: changing the angle of incidence ( 0) Dependant Variable: The angle of refraction Constant: The distance the light ray is placed away from the Perspex block to minimise error and the fading of the light ray. Materials: Geoliner or Protractor, Power Pack Light Kit & accessories, White paper Method: Analysis Angle of Incidence Refracted Angle 5 4 10 6 15 8.5 20 10 25 13 30 16 35 19 40 22 45 26 50 27.5 55 29.5 60 33.5 65 35.5 70 36.5 75 37 80 37.5 85 38 It can be seen that from the table, the light ray is bent towards the normal because the angle of incidence is greater than the

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