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If the situation is not critical, but just annoying us and requires our intervention nails and lips, we can "roll eyes» (to roll eyes). Not the most pleasant sight for your companion. Some people like to mash their fingers if they are thinking strongly about something or simply nothing to do. In everyday life this habit is called simply - crisp fingers, neck, back (to crack knuckles, neck, back). Doctors, incidentally, are not advised to do so.
Another, quite frankly, unpleasant action - is picking his nose (to pick your nose). What is in the nose, called boogers. On the nose and make another sniff, ie shmyhayut nose (she sniffs - it shmorhaye nose).
Another unpleasant sight - seeing a man who goes and splovuye saliva (to spit) Just feet. When this you see, includes feelings of disgust: Well, why like this? People can chew gum too loudly (to snap their gum), which is also annoying.
Do not cause approval and those in public talking on a cell phone (to talk on the phone). There are, of course, and urgent cases, but in most cases the cause of such phone calls - boredom. Another habit that occurs because of boredom or nerves - click ballpoint pen (to click a pen).
b - угол преломления
sin(a)/sin(b)=n
h-толщина стекла
L=h*tg(b) - смещение луча в стекле по горизонтали
L=h1*tg(а) -видимое смещение луча в стекле по горизонтали
h1 - кажущаяся толщина стекла
h1=L/tg(а) =h*tg(b)/tg(а)
х = смещение в стекле изображения
х = h - h1=h*(1-tg(b)/tg(а))
если горошина находится на расстоянии у от нижней грани, то изображение смещено на х и находится на расстоянии |y-x| от нижней грани
|y-x|= |y-h*(1-tg(b)/tg(а))| ~ |y-h*(1-sin(b)/sin(а))| =|y-h*(1-1/n)| =
=|5-3*(1-1/1,5)| см = 4 см