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DENJIRO: Today, I’ll show you a mysterious phenomenon using a clear liquid. There’s a clear liquid inside this container. It may appear as though there is nothing inside. However...
BOY: Something came out of the container!
DENJIRO: It’s a glass mouse figurine. Let’s place it inside the clear liquid again. You can’t see it anymore. It looks like it has disappeared.
NARRATOR: Why are you not able to see the glass when it is placed inside the liquid? Here’s an explanation. When light passes through something transparent, the light bends. This is called refraction, and because of refraction, we are able to see things that are transparent.
The value that measures how much light bends when passing through a certain substance is called the “refractive index.” The refractive index differs depending on the substance. Now, when light passes through two substances that have the same refractive index, there is no refraction.
DENJIRO: The glass mouse and liquid have the same refractive index. There is no refraction, and therefore, we cannot see the mouse.
The liquid is made from ethanol and benzyl alcohol.
NARRATOR: The container on the left has ethanol, which has a lower refractive index than glass. The glass mouse is visible here. Benzyl alcohol, in the container on the right, has a higher refractive index. But you can still see the mouse.
DENJIRO: However, when you mix these two liquids at a certain ratio, the refractive index becomes the same as glass. Therefore, the mouse becomes invisible. That means you can change the refractive index by mixing liquids with different refractive indexes.
NARRATOR: You can perform the same experiment with everyday items. It appears as though there is nothing inside this container filled with liquid. But there’s a transparent jelly-like substance inside. The liquid is water mixed with gomme syrup. If you adjust the ratio so the refractive index becomes the same as the jelly, the jelly becomes invisible.
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!”