- Shine a ray of light through a glass box using a light box
- Measure the angle of incidence and angle of refraction each time using a precise protractor for accuracy. Change the angle of incidence at 10° intervals, from 10°-100°
- You must repeat 3 times or more for varied results but also validity
- Use the equation r = sin I / sin R for the refractive index, you can graph the results
- Calculate the average to get an accurate value for the refractive index, ignoring anomalies.