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difference between fresnel and frounhofer diffraction

what is Fresnel’s diffraction? Fresnel diffraction can be observed if the source of light and the screen at which diffraction pattern is formed are kept at finite distance from the diffracting obstacle.In this situation the wave fronts falling on the obstacle are not plane.Similarly the wave fronts leaving the obstacle are not plane. what is Fraunhofer diffraction? Fraunhofer diffraction can ...

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difference between astronomical telescope and galilean telescope

Comparison table :                   Astronomical telescope     Galilean telescope 1:In an astronomical telescope the eye piece is a convex lens. 1:In Galilean telescope the eye piece is concave lens. 2:It forms an inverted image. 2:It forms an erect image. 3:The length  of astronomical telescope is: L =f0   + fe   ...

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difference between microscope and telescope

Difference table between microscope and telescope:     Microscope      Telescope                                                                                                 ...

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Difference between interference and diffraction

Interference of light: The modification in the distribution of light energy due to superposition of two or more waves is called interference of light. Conditions for interference: Light source should be monochromatic. Light source should be coherent mean they should not be independent but should be subsidiary source and derived from a single source. The light source should be narrow ...

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Difference between electric potential and electric potential energy

Electric potential: “Electric potential at a point in electric field is the amount of work done to bring the unit positive charge from infinity to that point.” The gravitational potential at point in the gravitational field is the gravitational potential energy of a unit mass placed at that point.In this way ,the electric potential at any point in the electric ...

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Difference between centripetal and centrifugal force

Centripetal force: “The force which is directed towards the centre of circle is called centripetal force.” Explanation: Consider a body moving with uniform speed in a circular path.In this case velocity changes only in direction and not in magnitude.Applying Newton’s first law of motion we find that some external force must be acting on the particle.Without presence of external force ...

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uses of laser in daily life

List of uses of laser and applications in the field of medicine,industry and agriculture : Laser beams are used as surgical tool for “welding”detached retinas. The narrow intense beam of the laser can be used to destroy tissue in a localized area. The organelles with a living cell have been destroyed by using laser to study how the absence of ...

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How can you determine the polarity of unlabeled magnet?

The polarity of an unlabelled magnet is determined by following methods. First method: Suspend the magnet freely with the help of a thread so that it can oscillate freely.When magnet comes to rest ,one end always points towards the northern end of the earth.This end of magnet is thus called the North pole.Similarly,the other end of the magnet pointing towards ...

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What is the difference between emf and potential difference?

Electromotive force: The emf is the energy supplied to unit charge by the cell or battery. It is also defined as “the potential difference between the terminals of a battery when no current is flowing through an external circuit when the circuit is open. Potential difference: The voltage across the terminals of the battery when the current is being drawn ...

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do electron tend to go to regions of high potential or low potential?

Electrons are negatively charged particles.When placed in an electric field ,negatively charged plate will repel them while positively charged plate will attract them.So,the electrons will move from negatively charged plate to positively charged plate.Since positively charged plate is at higher potential,while negatively charged plate is at lower potential.Therefore electrons tend to go from region of lower potential to a region ...

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