tag:blogger.com,1999:blog-23141204978200948172024-10-06T23:51:15.909-07:00Science and its related historyAnonymoushttp://www.blogger.com/profile/16249829279893508135noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-2314120497820094817.post-50343857841969154662015-09-08T05:16:00.001-07:002015-09-08T05:19:09.172-07:00

Q.1. What is meant by Refraction? Why does this take place ? A. The bending of light rays, as it travels from one medium to another having different refractive indices, is called refraction of light. The phenomenon of refraction takes place because of difference in the speed of light in different media. For eg, Light travels with 3x10^8 m/s in vacuum or air , 2x10^8 m/s in glass and 2.25x10^8 m/

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Characteristics of images formed in a plane mirror : 1. Size of the image is always equal to the size of the object. Hence, its magnification is unity. 2. The image formed is laterally inverted. When you stand in front of the mirror, your right hand appears left and your left hand appears right. 3. The image formed is as far behind the mirror as the object is in front of it. The image distance

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The phenomenon of rebouncing of light rays into the same mediumon striking a surface is called Reflection of light. Laws of Reflection Following are the two laws of reflection of light: 1. The incident ray, the reflected ray and the normal at the point of incidence all lies in the same plane. 2. The angle of incidence is always equal to the angle of reflection at the point of incidence. Angle

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Objects that emit light of their own are called Luminous objects. For example - Sun, stars etc. Whereas objects that do not emit light but are visible because light from other sources fall on them are called Non-luminous objects. For example - moon, chair, table, wall etc. If light rays coming from an object meet or appear to meet at a point after reflection or refraction, then that point is

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Light is an electromagnetic radiation that helps in the sensation of sight.The different properties of light can be understood only if we consider its dual character - wave and particle. Many optical phenomena can be understood if we consider light as waves. Some characteristics of light waves are - 1. They are electromagnetic in nature. They consist of oscillating electric and magnetic fields

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The night sky, with its large number of twinkling stars, have always fascinated mankind. Since the dawn of civilization, attempts were made and further improvements followed for making that perfect instrument for observing the stars, the planets and other celestial objects. What followed was a series of developments in the area of Optics, to achieve that perfect instrument, which now has lead to

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About hundreds of millions of years ago, when the Earth was formed, the Earth was a hot ball of molten substances containing everything that we see around us today. But gradually, with time, the upper surfaces began to cool and solidify. This process of cooling continued for millions of years forming the upper surface of the Earth - the Crust. The crust, thus, floats on semi-molten layers of

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Variation is important and occurs naturally for a species. As was put forward by Darwin's theory, the complex forms of life, that we observe around us today, were actually the result of continuous change and development of simpler forms of life, obviously the process is time consuming and is endless. Speaking lucidly, the gradual change of life forms from simple to complex is known as Organic

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The Andes range in South America is well known as a place for finding meteorites. It is known, that the meteorites were formed actually during the time of formation of solar system about 4.5 billion years ago. They are believed to have remained unchanged since then. So a close study of their constituents and properties actually revealed the nature of the substances that made up the different

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The cosmos never fail in conspiring different ways to amaze us and make us wonder about its different beautiful aspects. A nebula - the blue lights are the stars that are forming About 13.5 billion years ago, when our universe didn't take shape that we observe today, there was only gaseous Hydrogen of a nebula from which it was formed. Hydrogen is lightest of all the elements that can be

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The universe contains everything  - that which are known as well as the things that are unknown to humankind. Celestial bodies like the planets, the moon, the stars are all part of the universe. The universe is vast, much larger than we can imagine. During the day, we see the sun, whereas at night we see the moon, stars and some planets ,comets, meteors etc. When we look into the sky, we

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Space Exploration Why are we here? Where do we come from? These are some of the most intriguing questions that has always fascinated human mind. It's an essential part of human nature to find answers to such questions. Though we can trace our ancestry back to hundreds of thousands of years - the dawn of humankind, but in reality our story extends far - further back in time - to the beginning

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