The Mystery of the Dark Stripes. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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The Mystery of the Dark Stripes. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

There is a curious phenomenon that can be observed by passing at some distance near two fences made of pickets nailed at regular intervals. Such fences can be located either parallel or at some angle to each other. If you walk past such fences and look through the gaps between the picket fence slats of one fence to another, you can see how dark vertical stripes run like waves along the slats of the first fence. Their speed depends on you - on the speed with which you are moving. The distance between the dark waves is the same.

But a similar experiment can be done in a small size - at home, with the help of two large identical combs. But still, if you have to walk along the fences, pay attention to this phenomenon, so to speak, in nature.

So, arrange the combs horizontally with a gap of 2 centimeters from each other and at a distance of 25 centimeters from the eyes. Look through the gaps of the combs at some light background. Turn your head to the left, then to the right. You will see dark streaks moving across the teeth of the near comb at the speed of your head turning. This experiment can be done in another way - not to move the head, but to move one comb in relation to another. The dark stripes will also move.

The Mystery of the Dark Stripes

This phenomenon is explained as follows. The teeth of the second comb are further from the eyes than the teeth of the first. The distances between the teeth of the far comb will be visible at a smaller angle of view (and what is the angle of view, you know from past experience). Therefore, the thickness of the teeth and gaps will appear slightly smaller than the nearest comb. In some places, the teeth of the second comb completely cover the gaps between the teeth of the nearest comb. This is the dark bar that moves as you turn your head.

Having two identical combs, you can return to previous experiencewhen we got acquainted with the role of the diaphragm when looking at near objects.

Bring one comb closer to your eyes at a distance of 4-5 centimeters. Hold it horizontally and look through its teeth at some light surface or at the sky. The teeth will appear very thin and unsharp to you. As they say, they were not in the focus of your vision. Now bring a second similar comb into the space between the eyes and the comb, holding it also horizontally. You will immediately see clear, slightly enlarged teeth of the first comb. The gaps between the teeth of the near comb play the role of slit diaphragms and allow you to view the object at a closer distance. As in the previously described cases, the teeth appear larger due to the increased angle of view.

Author: Rabiza F.V.

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