human eye refraction

>At the time of sunrise and sunset, light from Sun has to pass maximum distance through Earth's atmosphere. As l r > l b red color is scattered least and can enter into our eyes. That is why sun looks red at the time of sunrise and sunset. Clouds are seen due to scattering of light from l..

Host cells infected with viruses produce a protein called interferon . In humans, it has been shown to be produced by leucocytes and T-cells. Some virus - infected cells release this glycoprotein called interferon. It diffuses into uninfected neighbouring cells and induces these uninfec..

The earth's atmosphere is a heterogeneous mixture of minute particles. These particles include smoke, tiny water droplets, suspended particles of dust and molecules of air. When beam of light strikes such air particles, the path of the beam becomes visible. Similarly the path of a beam of light pa..

Newton's Experiment - Dispersion of Light - Sir Isaac Newton, while studying the images of heavenly bodies formed by a lens, found that the images were coloured at the edges. In 1665, to investigate this, he performed an experiment using a prism. Newton darkened his room at Trinity College, Cambrid..

When the object is at infinity, the rays coming from it are parallel to each other. The image is - formed at F 2 inverted real highly diminished The table gives at a glance the position, size and nature of the image formed by a convex lens corresponding to the different positions of th..

. Certain homologous organs have no function in some species. Such as the appendix in human beings which is non-functional and its homologous organ is functional in herbivorous animals. Such non-functional homologous structures are called the vestigial organs. Other examples of vestigial ..

. The path along which the impulses travel in a reflex are called the reflex arc. There are five sense organs in humans - eyes, ears, nose, tongue and skin. Eyes are the visual sensory organs. They are equipped with the photoreceptors called the rods and cones. Each ..

). But then, the Mariner's bright eyes compel him to stay and listen. Then the ship gets caught in a storm and with 'sloping masts' and 'dipping prow', the ship flees towards the South and reaches the Antarctic regions - the land of mist, snow and icebergs as green as emeralds. They do no..

Scientific Methodology - Science is basically a collection of knowledge and information that is obtained by observation and testing of natural world, in a logical and orderly manner, and its interpretation. Hence, the basis of science is its orderly, step-wise procedure called scientific method. It..

Green House Effect - Before green house effect is studied one needs to know what kind of radiation / sunshine we receive on earth. 'Sunshine' is a common man's term indicating all that we receive from sun. In a shallow perspective of common man, it may simply, mean light. But in a deep scientific m..