Plotting scientific graphs by hand

This quick example graphs sin i against sin r for light entering glass. The gradient of the line can be used to calculate the refractive index. The gradient is more accurately calculated from the graph as this gives a graphical average - anomalous points can be ignored when considering the gradient.

In physics exams the world over, marks will be awarded for:
* axes as large as possible to try and fill the paper
* scales uniform and easy to plot (small divisions must not be irrational numbers!)
* points plotted correctly
* line of best fit drawn correctly - don't join the dots! Use a ruler in this instance, or draw a smooth curve if appropriate

[robertrichard]

Great video! I was wondering if you will do a video where you go through the solutions for this year’s physics exam. As a year 11 student this year doing physics unit 1 and 2, I’m curious to see how you go throw the questions. Thanks