Near Point increasing with age

The points between which the eye can see distinctly are called far point and near point. The far point is normally without limit (infinity) and near point depends on the accommodation of the crystalline lens. When we move a pencil slowly towards our nose. At some points, we observe that the pencil appears blurred. This

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Lens Formula & Power of the Lens

The relationship between the object distance (u), the image distance (v) and the focal length (f) of the lens is called lens formula. From the above formula, Focal length of a lens is obtained as follows: The power of a lens is the measure of its ability to produce convergence or divergence of a parallel

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Latent Heat

The latent heat of a substance is defined as the amount of heat absorbed by a unit mass of the substance to change its state without change of temperature. The heat absorbed during the change of state of a substance is used to overcome the force of attraction between the molecules of a substance. The

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Capillary Action

A glass tube with a very fine uniform bore is called a capillary tube. When a capillary tube is dipped vertically into a liquid contained in beaker, the liquid immediately rises or falls in the tube. The rise or fall of a liquid in a very narrow capillary tube is given by   Where: T

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Medium Earth Orbit (MEO)

MEO systems operate at about 8,000-20,000 km above the Earth, which is lower than the GEO orbit and higher than most LEO orbits. The MEO orbit is a compromise between the LEO and GEO orbits. Compared to LEOs, the more distant orbit requires fewer satellites to provide coverage than LEOs because each satellite may be

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Polar Orbit & Clarke Orbit

Polar Orbit The Polar Orbit is not much suitable for communication purposes because it moved in a different direction than that of direction of earth’s rotation. So, the use of Polar satellites depends upon their arrival at a particular point on earth at a particular point. The Polar orbits are used for special applications like

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Altitude of Geostationary Orbit

Important points The height of the geostationary orbit is 35786 kilometers above earth In Geostationary Orbit, the satellite moves with an orbital speed of 11068 km per hours. A minimum of three satellites are needed to cover the entire earth Super synchronous orbit is a disposal / storage orbit above GSO. From earth, they would

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Uniform Circular Motion

Uniform Circular Motion When a particle moves in a circle with a constant speed then the motion is known as uniform circular motion. We can consider an object moving in a circle with a uniform speed a round a fixed point O as centre. If the object moves from A to B so that the

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Freely falling bodies

Concept Notes 1 All objects in free fall experience same acceleration When there is no air, the acceleration of an object under free fall is independent of its mass When we let a coin and feather fall in an airless tube, both reach the bottom at same time. Freely falling bodies In physics, acceleration is

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