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Explain basic principle of holography
Holography is a new method of producing a 3D image of a 3Dobject. An ordinary photograph is only a 2D image of a 3D object. The photographic ?eld is resistive only to amplitude variation of the electromagnetic waves and it is not sensitive to point variations. So this photo does not give the phase information of the waves. In 1948, Dennis Gabor introduced a new method to record both amplitude and phase variation of the electromagnetic waves scattered from the object. When it is reproduced, we get a 3D image of 3D object. Hologram is a recorded inference pattern obtained by the object waves and the coherent reference wave
A resistor of 8Ω is connected in parallel with one of 12Ω and the combination is connected in series with one of 4Ω. A p.d. of 10V is applied to the circuit. The 8Ω resistor
Suppose you blow the top of a bottle and hear a resonance sound (standing wave). The length of the bottle is about 25cm. If the speed of sound in air is about 340 cm/sec., what i
The characteristic of a body by virtue of which the body takes its real configuration when external deforming forces are removed is called as elasticity.
a. Consider an x-ray machine with a step-up transformer consisting of a primary coil of 100 turns and a secondary one with 50000 turns. If the voltage applied across the primary co
#question.An experminet to prove that a substance is ferrmoanetic
The physical value which does not depend on any other physical quantity is known as a fundamental physical quantity like length; mass and time are known as fundamental units.
is the surface of a conductor is equipotential
Energy Transformation for Downhill Skiing Downhill skiing is a typical describe of the relationship among work and energy. The skier starts at an elevated position, therefore p
Ratio of masses of proton and electron is: (1) Infinite (2) 1.8x10 3 (3) 1.8 (4) None of these Ans: (2) 1.8x10 3
In X-ray tube, when high speed electrons strike the target, they move into the target. They lose their kinetic energy and come to rest inside the solid. The electron because of fin
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