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6A40.11 - Refraction of light ball in water

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​6A40.11 - Refraction of light ball in water

Title6A40.11 - Refraction of light ball in water

​To demonstrate the refraction of light between an air/water interface using a ball placed in a trough.

Assembly Instructions

​Position the ball roughly in the center of the tray and place the tray on the front corner of the lecture bench near the sink.  Mark the ball's front-to-back position with a piece of tape on the side of the tray for reference should the ball move when water is added to the tray.  Use the golf ball with embedded magnet to fix ball on surface of the tray in order to stop it from moving when water is added.  Fill a 4-L beaker with water.  Fill the tray with water until 25% of the ball is under the water.

Setup Time5
Operation Time5
Preview Time5
Operation Instructions

First, ask the students, how many can see the yellow ball?  Then carefully pour the 4-L beaker of water into the tray.  The ball should be fully submerged under the water.  Then, ask the students, how many can see the yellow ball now?  More students should be able to see it then.​

Demo on DimeNo
PIRA 200No
Export Instructions (if different)
Category6 Optics
Subcategory6A - Geometrical Optics
Keywordsrefraction, air, water, interface, optics
Construction Information
a neodymium magnet was press fit into a hole drilled in the bottom of a golf ball.
tray - black square
fill hose - water
yellow golf ball with mounted magnet inside