refraction of human eye

Introduction - Every cell, whether it is prokaryotic or eukaryotic, is enclosed in a thin covering called cell membrane . It is also called as plasma membrane or plasma lemma . The cell membrane can only be seen through the electron microscope since its thickness is well below the resolving power o..

Tyndall Effect - 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 ..

. 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 ..

>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..

). 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..

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 is a frame of mind that..

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 meaning of 'sunshine' ..

In Cutie Pie, the author describes the capture of an extra-terrestrial creature and his experiences on earth. The emphasis is on the basic human connection between the infant Winters and Cutie Pie, the E.T. creature. Indirectly, the author means that creatures living anywhere on any ..

The image is - formed at F 2 inverted real highly diminished When the object is at infinity, the rays coming from it are parallel to each other. Let one of the parallel rays pass through the focus F 1 and the other ray pass through the optical center. The ray which passes through..

. This zone is called troposphere. Therefore, at higher altitudes, some of us find it difficult to breathe. Above the troposphere is the stratosphere. This zone is rich in ozone. Hence, it is also called ozonosphere. In ozonosphere, the sunlight converts oxygen to ozone by photochemical dissolution..