According to Descartes? theory of the formation of the rainbow, a ray of sunlight is refracted as
Question:
According to Descartes? theory of the formation of the rainbow, a ray of sunlight is refracted as it enters a spherical raindrop, undergoes a single internal reflexion, and is then refracted as it leaves the drop, as shown in figure.
The rainbow is formed from the rays whose deviation from the original direction is either maximum or minimum. Show that the rainbow should form an arc of radius 42o round the point opposite to the Sun, and that it should have a width of approximately 1.6o with the red part on the outside. (The refractive index of water is 1.330 for red light and 1.341 for violet light.)
Step by Step Answer:
We will assume that the incident ray makes and angle with the normal to ...View the full answer
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Using a few basic physics principles, you can impress your friends with a trick that makes a bottle disappear. For this experiment, you will need a mini plastic bottle, glycerin, a glass, and a funnel. First, open the bottle and pour some glycerin into it, then close the bottle tightly. Next, pour some water into the glass using a funnel. Place the mini bottle into the glass of water and it will look normal. This is because light travels through air faster than it travels through the glass and water, allowing our eyes to see the bottle inside the glass. However, when you fill the mini bottle with more glycerin, and pour glycerin into the glass, then put the glycerin filled bottle into the glass with glycerin in it. Half of the bottle that is submerged in the glycerin will become invisible as the light travels through glass and glycerin at the same speed, thus it does not bend and no refraction takes place, making the bottle invisible. This happens because both glass and glycerin have almost the same refractive index, which causes the speed of light to be the same in both mediums, causing no bending of light and making the bottle disappear.
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