As I wrote before, We see objects only because they all reflect light.
After beam of light starts its way from a light source, it touches objects, reflects and reaches our eye.
sometimes these reflected beams of light cannot reach our eye, because of other objects between the object and our eye. and we don't see a part of that object.
what exactly happens when the light cannot reach our eyes?
Imagine that we are watching at a wall, in a dark room, with one lamp...
light which comes from a light source, a lamp, reaches the wall, reflects from it, and reaches our eye.
If
1. we put our hand between the wall and our eye, we will not be able to see a part of the wall, because "the reflected" light cannot reach our eye. But we will see our hand, because a light, reflected from, our hand reachs our eye.
2. we put our hand between the wall and a lamp, the light from the lamp, will not reach the wall, and instead we will see a dark spot. why? because there is an obstacle, our hand. that's why that spot will have a shape of our hand.
Border between a light and a shadow is YOU! (Stanislav Yezhi Lec, "Good and Evil")
Aziz Shahhuseynov. special thanks to Franz
Sunday, 29 November 2009
Thursday, 19 November 2009
Objects in mirror are closer than they appear
Objects in mirror are closer than they appearHave you ever seen this phrase?
If you have a car, then 90% that you have seen it!
But why? Why objects in the mirror ACTUALLY are closer than they appear?
The warning is used because passenger side mirrors must be convex to have a useful field of view. This makes objects smaller than they would appear if the driver viewed them in a flat mirror, or turned and looked at them directly. Since smaller objects appear farther away, the objects seen in the mirror look further away than they really arewikipedia
But, there is something else!
When you look in a mirror, mirror shows exact reflection of you and everything around you.
The distance between you and a mirror is, for example 3 meters.
But between that guy in the mirror and the mirror distance is also 3 meters.
So, you see a distance between YOU and a mirror, and between mirror and your reflection.
That’s why, in the mirror you will see not 3 meters, but 6 meters.
Be careful, while parking your car :-)
Aziz Shahhuseynov
Wednesday, 11 November 2009
What is colour? Where does it come from?
We see objects only because they all reflect light.
As you know things consist of molecules, and molecules - of atoms...
Each atom consists of a nucleus (made of protons and neutrons) and then there are the electrons orbiting around it.
For example let's take the simplest atom, the atom of Hydrogen (H). It consists of one proton and one electron spinning around it. This electron can spin on 6 levels over the nucleus. In static position it spins on the closest first level.
As soon as it gets energy – any energy - heat, power, light, it moves on to the next second level. Then it progresses to the third, fourth, fifth and to the sixth levels. On the sixth level it stays for 8 to 10 s. and then “goes back”.
At this moment, when the electron moves from the higher level to the lower one, it gets rid of the energy it got earlier.
When it reaches our eyes we see this radiation of energy like a beam of light.
Do you see this? It’s only ONE atom, with only one electron, with only 6 orbits. Imagine how much beams of light other molecules radiate, the molecules with more than one electron: 2, 3, 5, 8, 13, 21 and so on.
As you can see, "colour" (beam of light) reflected by any object depends on the structure of the atoms and molecules it consists of.
by Aziz Shahhuseynov, special thanks to Marieke and Lyubov
As you know things consist of molecules, and molecules - of atoms...
Each atom consists of a nucleus (made of protons and neutrons) and then there are the electrons orbiting around it.
For example let's take the simplest atom, the atom of Hydrogen (H). It consists of one proton and one electron spinning around it. This electron can spin on 6 levels over the nucleus. In static position it spins on the closest first level.
As soon as it gets energy – any energy - heat, power, light, it moves on to the next second level. Then it progresses to the third, fourth, fifth and to the sixth levels. On the sixth level it stays for 8 to 10 s. and then “goes back”.
At this moment, when the electron moves from the higher level to the lower one, it gets rid of the energy it got earlier.
When it reaches our eyes we see this radiation of energy like a beam of light.
Do you see this? It’s only ONE atom, with only one electron, with only 6 orbits. Imagine how much beams of light other molecules radiate, the molecules with more than one electron: 2, 3, 5, 8, 13, 21 and so on.
As you can see, "colour" (beam of light) reflected by any object depends on the structure of the atoms and molecules it consists of.
by Aziz Shahhuseynov, special thanks to Marieke and Lyubov
Monday, 19 October 2009
More than 2 children?
Why it's SO important to have more than 2 children in a family.
Imagine:
If 2 sets of parents, each have one child, there are half as many children as parents.
If those children have one child, then there is 1/4 as many grandchildren as granparents.
And this means that the population of your nation is decreases.
Imagine:
If 2 sets of parents, each have one child, there are half as many children as parents.
If those children have one child, then there is 1/4 as many grandchildren as granparents.
And this means that the population of your nation is decreases.
Saturday, 17 October 2009
Basic demographic equation
Suppose that a country (or other entity) contains Populationt persons at time t.
What is the size of the population at time t + 1 ?
Natural increase from time t to t + 1:
Net migration from time t to t + 1:
This basic equation can also be applied to subpopulations. For example, the population size of ethnic groups or nationalities within a given society or country is subject to the same sources of change. However, when dealing with ethnic groups, "net migration" might have to be subdivided into physical migration and ethnic reidentification (assimilation). Individuals who change their ethnic self-labels or whose ethnic classification in government statistics changes over time may be thought of as migrating or moving from one population subcategory to another.
More generally, while the basic demographic equation holds true by definition, in practice the recording and counting of events (births, deaths, immigration, emigration) and the enumeration of the total population size are subject to error. So allowance needs to be made for error in the underlying statistics when any accounting of population size or change is made.
What is the size of the population at time t + 1 ?
Populationt + 1 = Populationt + Naturalincreaset + Netmigrationt
Natural increase from time t to t + 1:
Natural Increaset = Birthst − Deathst
Net migration from time t to t + 1:
Netmigrationt = Immigrationt − Emigrationt
This basic equation can also be applied to subpopulations. For example, the population size of ethnic groups or nationalities within a given society or country is subject to the same sources of change. However, when dealing with ethnic groups, "net migration" might have to be subdivided into physical migration and ethnic reidentification (assimilation). Individuals who change their ethnic self-labels or whose ethnic classification in government statistics changes over time may be thought of as migrating or moving from one population subcategory to another.
More generally, while the basic demographic equation holds true by definition, in practice the recording and counting of events (births, deaths, immigration, emigration) and the enumeration of the total population size are subject to error. So allowance needs to be made for error in the underlying statistics when any accounting of population size or change is made.
Women's rights in Islam
Effort to improve the status of women in Islam occurred during the early reforms under Islam between 610 and 661, when women were given greater rights in marriage, divorce and inheritance.[1] In 622 the Constitution of Medina was drafted by the Islamic prophet Muhammad, outlining many of Muhammad's early reforms under Islam, including an improved legal status for women in Islam, who were generally given greater rights than women in pre-Islamic Arabia[1][2] and medieval Europe.[3] Women were not accorded with such legal status in other cultures until centuries later.[4]
[1] Esposito (2005) p. 79
[2] Majid Khadduri, Marriage in Islamic Law: The Modernist Viewpoints, American Journal of Comparative Law, Vol. 26, No. 2, pp. 213-218
[3] Encyclopedia of religion, second edition, Lindsay Jones, p.6224, ISBN 0-02-865742-X
[4] Lindsay Jones, p.6224
[1] Esposito (2005) p. 79
[2] Majid Khadduri, Marriage in Islamic Law: The Modernist Viewpoints, American Journal of Comparative Law, Vol. 26, No. 2, pp. 213-218
[3] Encyclopedia of religion, second edition, Lindsay Jones, p.6224, ISBN 0-02-865742-X
[4] Lindsay Jones, p.6224
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