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Human Eye
'. The persistence of vision is approximately one eight of a second. Even though human eye has the property of accommodation, the muscles cannot be strained beyond a limit and hence if the object is very close to the eye, clear image is not formed on the retina. Thus, ..
Laws of limiting friction
The direction of limiting frictional force is always opposite the direction of motion. Limiting friction acts tangential to the two surfaces in contact. The magnitude of limiting friction is directly proportional to the normal reaction between the two surf..
Experiment to verify the laws of limiting friction
Take a block of wood of specific mass, a thread, pulley, a pan and a few weights and arrange them as shown in the figur..
Take a block of wood of specific mass, a thread, pulley, a pan and a few weights and arrange them as shown in the figur..Binocular and stereoscopic vision
In man, the eyes are frontal and thus the vision is binocular. This means that the image finally perceived is the result of the information received from both the eyes. Binocular vision results in stereoscopic vision that gives a 3-dimensional image. Thus, this capability of st..
Kinetic Friction
If the force applied on the body is greater than its limiting friction, then the body begins to slide. This is when we forget about static friction and consider kinetic or dynamic friction. Kinetic or dynamic friction comes to play when there is a relative motion between the two surfaces ..
Remote Sensing
"Remote Sensing" can be defined as obtaining information about an object by observing it from a distance and without coming to actual contact with it. Infact when we see an object and understand what it is, our eye is sensing that object remotely. This is a broad definitio..
Anatomic barriers
. One such mechanism that protects the eye is the lacrimal apparatus . The continuous washing action of tears produced by the lacrimal glands, helps to keep microbes from settling on the surface of the eye. If an irritating substance or large number of microbes make contact..
Significance of Uncertainty Principle in Daily Life
It should be borne in mind that the uncertainty is not due to lack of sufficiently refined techniques but it is due to the fact that one cannot observe microscopic things without disturbing them. No instrument can observe the position of an electron without affecting its motion. In other words, unc..
Friction - A Self-adjusting Force
.e., the force of friction and the applied force are not balanced. The maximum value of the force of friction, which comes into play when a body just begins to move over the surface of another body is known as the limiting friction. When there is no relative motion between the two surface..
Presbyopia
Presbyopia - Presbyopia is caused when the centre of the eye lens hardens making it unable to accommodate near vision. This condition generally affects almost everyone over the age of 50 - even those with myopia. Eyeglasses with bifocal or progressive lenses are prescribed to correct or i..
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