मराठी

Define a wavefront.

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प्रश्न

Define a wavefront.

What is meant by a wavefront?

व्याख्या
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उत्तर १

Wavefront is defined as the locus of all the points in space that reach a particular distance by a propagating wave at the same instant.

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उत्तर २

A wave front is defined as a surface of constant phase.

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पाठ 7: Wave Optics - Evaluation [पृष्ठ १०३]

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

The wavelength of light in a medium is \[\lambda = \lambda_0 /\mu,\] where \[\lambda \] is the wavelength in vacuum. A beam of red light \[\left( \lambda_0 = 720\text{ nm} \right)\] enters water. The wavelength in water is \[\lambda =  \lambda_0 /\mu = 540\text{ nm.}\] To a person under water, does this light appear green?


If we put a cardboard (say 20 cm × 20 cm) between a light source and our eyes, we can't see the light. But when we put the same cardboard between a sound source and out ear, we hear the sound almost clearly. Explain.


The speed of light depends ____________ .


Three observers A, B and C measure the speed of light coming from a source to be νA, νBand νC. A moves towards the source and C moves away from the source at the same speed. B remains stationary. The surrounding space is vacuum everywhere.

(a) \[\nu_A  >  \nu_B  >  \nu_C\]

(b) \[\nu_A  <  \nu_B  <  \nu_C\]

(c) \[\nu_A  =  \nu_B  =  \nu_C\]

(d) \[\nu_B  = \frac{1}{2}\left( \nu_A + \nu_C \right)\]


Find the range of frequency of light that is visible to an average human being

\[\left( 400\text{ nm }< \lambda < 700\text{ nm}\right)\]


A parallel beam of light of wavelength 560 nm falls on a thin film of oil (refractive index = 1.4). What should be the minimum thickness of the film so that it strongly reflects the light?


Plane microwaves are incident on a long slit of width 5.0 cm. Calculate the wavelength of the microwaves if the first diffraction minimum is formed at θ = 30°.


Answer in brief:

The distance between two consecutive bright fringes in a biprism experiment using the light of wavelength 6000 Å is 0.32 mm by how much will the distance change if light of wavelength 4800 Å is used?


A parallel beam of green light of wavelength 550 nm passes through a slit of width 0.4 mm. The intensity pattern of the transmitted light is seen on a screen that is 40 cm away. What is the distance between the two first-order minima?


Young’s double-slit experiment is carried out using green, red and blue light, one colour at a time. The fringe widths recorded are WG, WR, and WB respectively then ______ 


What is the relation between phase difference and Optical path in terms of speed of light in a vacuum?


State any four conditions for obtaining well defined and steady interference patterns.


Emission and absorption is best described by ______.


State the theories which were proposed to explain nature of light.


Light emerges out of a convex lens when a source of light kept at its focus. The shape of wavefront of the light is ______.


According to the wave theory proposed by Christian Huygens, how does light propagate?


In what year did Thomas Young perform the interference experiment?


Which approximation is the basis of geometrical optics?


Which set of topics is included in wave optics?


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