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# To find the speed of light in glass using Snell's Law / To prove the Snell's Law

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Introduction

Name:        Jonathan Tam                Class:        12A

Phyiscs

Experiment Report – Data Processingand Presentation, Conclusion & Evaluation

Aim:        To find the speed of light in glass using Snell’s Law / To prove the Snell’s Law

Data Collection:

Speed of light in air:        299702547 ms-1

(From http://www.what-is-the-speed-of-light.com)

 Angle of incidence (± 0.5°) Angle of reflection (± 0.5°) 63 37 54 32 42 26 34 22 26 16 25 15 11 8

Data Processing and Presentation: We can simply plug in the values of , and into the equation

Middle

0.438

0.276

0.423

0.259

0.191

0.139

By rearranging the formula, we have: So we need the value of then take the avrage of this ratio and multiply it by the speed of light in air. 0.675 0.655 0.655 0.670 0.629 0.612 0.729

Average: 0.661

Please be aware that this is a ratio which has no units.

0.661 * 299702547 ms-1 = 198063544ms-1

We have the equation , which follows the pattern y = mx. We can plot a graph in order

Conclusion

There are few limitations in this experiment.

 Apparatus / Variable Limitations / Discussions Improvements Protractor High uncertainty / Not precise enough Make the angle larger to decrease percentage error Light ray Light ray is diffracted and is hard to determine the angle of incidence and refraction Use a lens to focus the light rays in order to narrow it Material of refraction Uncertain whether it is purely glass or partly glass (might be mixed with other materials eg plastc) Check and see if the container cleaerly says “glass block” or “plastic block”

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