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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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Name:        Jonathan Tam                Class:        12A


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°)















Data Processing and Presentation:


We can simply plug in the values of image01.png ,image08.png and image05.pnginto the equation

...read more.








By rearranging the formula, we have: image09.png

So we need the value of image02.pngthen take the avrage of this ratio and multiply it by the speed of light in air.









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 image09.png, which follows the pattern y = mx. We can plot a graph in order

...read more.


There are few limitations in this experiment.

Apparatus / Variable

Limitations / Discussions



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”

...read more.

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