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J. Perelman
"Entertaining physics". Book 1.
Chapter 9. Vision one and two eyes

A STRANGE EFFECT OF A MAGNIFYING GLASS

Nearsighted people, as we have explained, very ordinary pictures to see relief. But what about people with normal eyes? They can't move up images very close to the eye, but they will help here a magnifying glass. Looking at the image through the lentils with the increase in two times, such people can easily acquire these benefits are myopic, i.e., without straining the eye can see, as the picture gets bumpy and depth. The difference between the impression and the fact that we can see looking at the picture of two eyes from a distance, is huge. This method is to consider an ordinary pictures almost replaces the effects of the stereoscope.

Now it becomes clear why the photos often get relief, if you look at them with one eye through a magnifying glass. This fact is well known. But the correct explanation of the phenomenon we hear often.

One of the reviewers “Entertaining physics” wrote to me about this:

“The next edition will look at the question: why in the ordinary Lupu photography seems to be a relief? My opinion is that all complex explanation stereoscope not stand up to criticism. Try to look into the stereoscope one eye: relief persists in spite of the theory”.

Readers, of course, it is clear now that the theory stereoscope does this fact does not change.

Based on the same curious effect of so-called “panoramas”, sold in toy stores. In these small devices common picture of the landscape or group is seen through a magnifying glass to one eye. This is enough to get the relief; the illusion is commonly intensify the fact that some objects in the foreground are cut separately and placed ahead of pictures; our eyes are very sensitive to the relief of the nearest objects and not as susceptible to more distant terrain.

Entertaining physics J. Perelman

 




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