Surely all happened so that you look at a machine that is going forward, and there is a feeling that the wheels are moving in the opposite direction or does not move.Or, for example, in some film flies a helicopter, and it seems that the blades do not rotate.This is the stroboscopic effect, which is rather difficult concept in the field of physics.If you delve into the definition of the Greek language, this phrase would mean another set of concepts of "spinning" and "watch" (also translated as "vortex" and "treat").And this is a classic optical illusion, which is due to several factors.
What is the effect
stroboscopic effect - it is nothing like an optical illusion that occurs when a distorted perception of the moving parts.And we can not say that in physics there are two main types of this effect:
1. The first type is characterized by the fact that in monitoring the rapidly between the individual phases of motion there is an illusion of continuous movement.It is associated with features of visual perception.For example, if the time between occurrences of any individual images much smaller gap, then the images are merged, and the continuous movement is perceived.It is based on this effect the movement in the film, provided that the rate of filming and projection is approximately equal to the frequency of the ongoing process.
2. The effect of the second type implies that under some specific circumstances will the illusion of peace object that actually moves, and an example of the helicopter causes exactly this type of stroboscopic effect.But it plays a special role light.
Such optical illusion of actually watching everyone just someone it does not pay attention, while others simply do not explain the physical origin of this effect the soil.However, the difficulties in perception caused by such actions and a number of biological factors, in particular, we are talking about the features of the construction of the visual perception of the body and the surrounding reality - it's called persistence of vision.
Notable examples of this effect in real life
In fact, if we talk about the stroboscopic effect and where it can be seen in real life, it is quite difficult to give examples.And the most obvious example, which can be observed all this disco.How does this impact on the dance floor?Naturally, the clubs have special lighting and lots of mirrors.All of this contributes to the fact that when people are dancing, there is a feeling that they move like robots.Naturally, this is connected with flickering light and the peculiarities of his perception of the human body.
Also, if you have a slow-motion camera, you can watch the stroboscopic effect, if you remove the drip of water from the tap.As a result, you will see that one drop is certain passages in all the gaps, and fallen, we think smoothly.
Quite a lot of examples of this effect is played by physicists in the laboratory.For this play certain light with switching power, with the ability to adjust the frequency - is the strobe lights.Thus, for these studies can be seen, for example, features of the motion of the fan blades.When a particular light may occur feeling that the blade at regular intervals moving in different directions or even become immobile.Also, using a strobe is possible to observe the movement of the ball, and the peculiarities of its trajectory.This effect and the strobe, in particular, used not only to identify some theoretical moments but also useful for the production of certain machine parts.
