Optics reflection refraction

Optics in summer means presetting all gear for lecture and laboratory.

The refraction tanks, apparent depth cylinders and beakers, meter sticks, hidden coin replete with a ceramic tile cover from the geology lab, laser, half rounds, mirror tiles, optics accessories bin, small tank. The small tank is now up with the optics gear. Set up is over 40 minutes on a 7:20 start - water has been going off regularly. 


Two bins. Pennies and quarters. Later supplemented with Sacagaweas. 


Still not super happy with reflection issues.


A single front light and turning off the other lights appears to help.

Maybe that helped?

Blacked out the whiteboard just for good measure. An hour of fiddling around. 

Used the small rectangular tank for total internal reflection and apparent depth.

This was my new refraction demonstrator. By holding the laser fixed straight ahead and rotating the dish on the paper towel the movement of the refracted laser beam was much easier to demonstrate. Total internal reflection was also easier to show.

I was able capture a single drop of water using the Pixel to show water drops are round, not teardrop shaped. This dovetailed into my rainbow diagram. Memo to future explanations: get the color order right.

Right board was filled first.

Then the left board with the rainbow wrong.


The rainbow diagram on the whiteboard was reversed order. Higher frequencies undergo more refraction.

After the break notes.

There was an oversight in the layout of the laboratory report: the data analysis was inserted post hoc.


Maria and Berny taking reflection data

Sidney, Loyeesha, and Sru

Etwet works on reflection with Rollin and LaPrincia


Etwet calls out the measurement, Rollin steadied the mirror, LaPrincia records data.

Sidney working with his smartphone.


Using Desmos, data entry can be done on a smartphone. In this class smartphones are a tool.


Berny, Sru, Maria, and Sidney taking apparent depth measurements.



Sru makes an apparent depth measurement.


Locating the apparent depth of the penny image in the water.

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