3 Refraction experiment
There are many fun experiments in refraction experiments. Please enjoy without emphasizing the principle too much.
Experiment 1: Transparent human with salad oil
Being able to see an object means that the object reflects the sun's rays, etc., and the reflected and refracted light enters your eyes and creates an image with your retina. If the light is in the same way, it looks the same to the eye. The refractive index of glass and salad oil is almost the same. It is an experiment using it
Stack large and small beakers as shown in the photo on the left. If you put salad oil in it, the beaker inside will disappear.
Beakers in oil can be seen because the light passing through the beakers has a different refractive index than oil, and the way it travels changes. However, oil and glass have almost the same refractive index, so even if light passes through the beaker inside, it does not refract. Light will pass through as it is. Therefore, it looks just like salad oil to the human eye. It will be a transparent beaker.
Experiment 2: Disappearing deodorant
The refractive index of the deodorant is almost the same as that of water as in Experiment 1. Unlike oil, it is easy to clean up.
Experiment 3: The disappearing apple
Draw a picture of a red apple on a piece of paper. Only the outline of the apple is drawn on the plastic bag. When you put this in water and see it from diagonally above, the red apple becomes transparent!
This is not because the color of the apple has disappeared, but because the apple written on the paper can no longer be seen from diagonally above. As shown in the figure below, even if the light emitted from the apple tries to move toward the person in A, it repeatedly refracts water and air and moves in the direction of B. It will not be visible to those in A, but it will be visible if you look at the aquarium from the side.
