Thursday, September 13, 2007
title:{FORMATION OF A RAINBOW!!}
now, we're going to find out more about the brief description of the formation of a rainbow!! enjoy!!
When light travels from one medium to another, it bends. In other words, it changes direction and moves at different speeds in different mediums. This property of light is called “refraction”. We also know that white light is made up of different colours. Different colors of light have different frequencies. Except in vacuum and air, they travel at different speeds in different mediums.If you were to allow a beam of light to pass through a simple prism, it will bend when it enters the prism, when it leaves the prism it bends again. The different colours of the white light travel with different speeds inside the prism. The slanted surfaces of the prism makes the different colours emerge separately, thus in addition to bending light as a whole, a prism separates white light into its component colors. This splitting of light into its component colours is called dispersion, where prism is a dispersing element.This is exactly what happens when the sun rays hit droplets of water. When the sunlight strikes a raindrop, the light is refracted (bent) because the light is moving from one medium(air) to another( water). Drops of rainwater can disperse light in the same way as a prism.. When the light comes out of the water droplet, the sun's rays (white light)have now been split into their component wavelengths (colors). In this way, each individual raindrop behaves just like a prism, dispersing white sunlight into its seven component colors and a rainbow is formed. The rainbow we see is thus a result of many, many raindrops bending the sun's rays.
8:20 AM;
Wednesday, September 12, 2007
title:{Subtractive color(red, yellow, blue)}
primary colors
secondary colors
tertiary colors
Most artists recognise red,yellow and blue as the 3 basic primary colors. these primaries are the pure colors which can not be created by mixing any other colors. secondary hues are the result of the mixing any of the two primaries. tertiary colors result from mixing the secondary hues.
11:24 PM;
title:{}
11:14 PM;
Tuesday, September 11, 2007
title:{MIXTURE OF COLOURS!!}
a new section of ''educational videos'' have been uploaded..feel free to look at it-thnks! below are 2 pictures of the primary and secondary colours of colours when they are being shone together or mixed.. for e.g. primary colours red green and blue will appear white!! -interesting yeA? you guys may tag at the discussion board if you have any enquires and hopefully, it will be answered asap!! HAVE FUN!!
8:21 AM;
Monday, July 30, 2007
title:{}
The color systems used by scientists and artists are totally different.An artist will mix blue and yellow paint to get a shade of green;a scientist will mix green and red light to create yellow.The printed page in a magazine is yet another system.Now,lets seperate the two different kinds of color in the world.First,there's the color you can touch,such as the skin of the apple or a painted wall.These colors are part of the surface of an object.Next,there's the color you can't touch,such as a beam of light and the colors produced by your computer monitor.Colors generated by light are part of a color system.The tangible colors which are on the surface of objects or on the printed page are another color system.Additive colour mixingAdditive colour mixing is the reproduction of any desired colour by adding together different amounts of just three colours,red,blue and green,which are called the additive primaries.This is how the colours in TV pictures are produced.The back of a TV screen is covered with a regular array of dots of three kinds of materials called phosphors.One kind glows red when an electron beam inside the TV tube hits it.The other kinds glow blue,green,respectively.Purple is created by stimulating the dots that glow blue and red.Yellow is created by red and green glowing dots.White is created by a mixture of red,green,and blue.Subtractive colour mixingsubtractive colour mixing is used in photographic transparencies and prints.Such pictures are made of transparent layers,each layer partly clear and partly coloured with one of the subtractive primaries-magenta(red-blue),cyan(blue-green),or yellow(a combination of red and green).White light shining on the picture is a mixture of red,green and blue light.In this print industry,cyan,magenta,yellow and black are used as the primary colors.When you mix all the colors,the result is grey.Seperation of white light into coloursLight from many sources,such as sunlight,appears white.When white light passes through a prism,however,it seperates into a spectrum of varied colours.The prism bends,or refracts,light of different colours at different angles.Red light bends the least and violet bends the most.Light entering a prism is refracted towards the normal,and the emerginf ray is refracted away from the normal,turning the ray through a considerable angle.Because the refractive index of a substance varies for the different wavelengths,a prism can spread out the various wavelengths of light contained in an incident beam and form a spectrum.
5:01 PM;