Bubbles

ALICE AND FINEENS LUMA PROJECT : BUBBLES.

How do BUBBLES connect to LIGHT and fit into the show?

Bubbles refract and reflect light. They also have that weird rainbow thing on the outside.

The structure of bubbles is cool and different shapes could be a good demonstration (however not connected to light). Could connect them to concave and convex lenses?

Idea: recreate this effect? (from dara O'Brien's school of hard sums )

If we could make this 3d it would be cool.

BUBBLE MIXTURE RECIPE:

6 cups of water (1 cup = 240ml)
1 cup of dish soap (slowly stir it until the soap is mixed in. Try not to let foam or bubbles form while you stir)
1 tablespoon of glycerin or 1/4 cup of corn syrup (1 tbsp= 15ml)

Attempts at making bubbles different 3d shapes:

Script plan/outline:

Start with intro to concave and convex lenses and basic explanation of the EMF spectrum and light waves.
Diagram of how bubbles work to reflect and refract light.
Example of colour and light around bubbles.
Then zoom in to see the bubble moving and explain this??
Zoom out and demonstrate the properties of bubbles (shapes, the way they find the most direct route possible)
End with square and pentagonal and triangular bubble.

Practicing filming up close with phone to test the lighting?

20190402_161114.mp4

20190402_161047.mp4

RESEARCH

Reflection and Refraction of Light:

Bubble mixture and the properties of glycerol:

Bubbles:

A bubble is air trapped inside of a soap film. There is a thin layer of water between the soapy film, sort of a water sandwich. The bubble mixture stretches to form all kinds of shapes, but when you seal it the tension in the bubbles skin shrinks to form the smallest possible shape for the volume of air it contains. A bubble pops when the soap molecule on the soap layer evaporate. A bubble gets its color from light waves reflecting between the soap film’s outer and inner surfaces. The distance between the layers gets smaller as the water evaporates, making the colors change. Bubbles can also reflect what’s around them, like the faces peering at them.

Why does bubble mixture move?

How light interacts with bubbles:

When a light wave hits the surface of a bubble, part of the light is reflected back to a viewer's eye from the outer surface and part of the light is reflected from the inner surface which is a few millionths of an inch further. As the two waves of light travel back, they interfere with one another causing what we know as color. When the waves reinforce each other, the color is more intense. When the wave get close to canceling each other out, there is almost no color. As a bubble wall gets thinner, either from a weak solution or because gravity has pulled its chemical content to the bottom, the distance between the inner surface and the outer surface of the bubble becomes less and less until the two reflected waves of light start to coincide and cancel each other out. The result is that the bubble loses its color and can become nearly invisible.

https://www.youtube.com/watch?v=FAzPfm-0onI&has_verified=1 - good video on playing with bubbles

Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out (they diverge). A concave lens is a diverging lens.

When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.

The distance between the principal focus and the centre of the lens is called the focal length.

The image formed is virtual and diminished (smaller)

Examples include nearsighted glasses and peepholes.

Convex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

The distance between the principal focus and the centre of the lens is called the focal length.

https://www.exploratorium.edu/science_explorer/bub_dome.html

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