PhysicsLAB Worksheet
Refraction Through a Circular Disk

 
Light of wavelength 450 nm strikes a circular disk of leaded glass as shown in the diagram below.
 
On your printouts, construct a normal and use a protractor to measure the ray's angle of incidence to one decimal place. 

Continue taking data by measuring the ray's angle of refraction inside the circular disk to one decimal place. 

If the index of refraction for air is n = 1.00, use Snell's Law to calculate the index of refraction of the circular disk to two decimal places. 

Using your value for the index of refraction of leaded glass from the previous question, calculate the average speed at which this beam of light travels through the circular disk. 

Measure the distance (to one decimal place) that the light beam will need to travel as it moves through the circular disk. 

How many seconds does the light require to make the journey through the leaded glass circular disk? 

Using your value for the index of refraction of the glass, calculate the wavelength of this beam of light as it passes through the disk. 

What is the frequency of this beam of light? 

On your printout sketch the path of the ray as it exits the circular disk. Justify your angle using Snell's Law. Label all necessary angles on your diagram and show all of your calculations.
 





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