# To Investigate what Factors Affect Reflection.

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Introduction

To Investigate what Factors Affect Reflection

Prediction: The angle of incidence is proportional to the angle of

Refraction.

Angle I | Angle r |

10 | 6 |

20 | 14 |

30 | 21 |

40 | 28 |

50 | 34 |

60 | 39 |

70 | 44 |

80 | 47 |

Results:

Angle I | Angle r |

10 | 8 |

20 | 15 |

30 | 20 |

40 | 28 |

50 | 33 |

60 | 38 |

70 | 42 |

80 | 47 |

Middle

50

33.5

60

38.5

70

43

80

47

Averaging= I=20 r=14+15

2

R=14.5

Analysing Graph

The graph shows my averages of the angle of Incidence against the angle of Refraction. The graph shows a very slight curve. This suggests that my results are not quite accurate. This could be because the angles are not accurate, or in proportion. This means that at the start of the graph, the results are in proportion but as the angles increase, the angles become less proportionate.

E.g. If I double the angle of incidence the angle of refraction will also be doubled-

Angle I=20 Angle r=14

When doubled Angle I=40 Angle r=28

This does not happen on my averaged results, which means that my graph is not accurate. This means that my Graph does not support my prediction.

A better way of getting results that are more proportional would be to use ‘Snell’s Law’.

Conclusion

The quality of the snells graph was much better than my first graph, as it is more accurate because the gradient is close to the refractive index. The snells graph is also more accurate as the line of best-fit shows that there are no anomalous points.

I could have improved the investigation by repeating the experiment a few more times to gather more results, to compare the accuracy.

The main problem with this investigation was that it was hard to plot the ray line and to plot the angles accurately. To prevent this the block could have been larger because this would mean that the ray line would be easier to draw on as it wouldn’t be quite as thick and the angles would have been easier to draw on if there was a larger and clearer protractor as points were slightly out of place.

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