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# refractive index prac report

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Introduction

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

Middle

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 refracted angle thus stating that the Perspex block is of a greater density than air. The graph above shows the angle used against the refracted angle. From the

Conclusion

Conclusion: It can be seen that from the results, as the beam of light enters from air into the Perspex block the beam is bent towards the normal. This means that the Perspex block is denser than air

By Matt Bauer 11.4

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