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JEE Exam » JEE Study Material » Physics » Wavefront

Wavefront

Wavefront is the set of all points in a medium where the wave is at the same phase. Learn about Wavefront, Application, related questions in this study material.

Table of Content
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Periodic waves are employed in physics to describe the propagation of energy in the form of light, sound, wind, or any other kind of energy. This wave is described as a function of sinusoidal waves since it is a smooth periodic oscillation. Previously, light was described as a collection of extremely small particles with no mass. It was also hypothesised that the particles of various coloured photons differed. Based on this idea and the fact that light particles are elastic in nature, all other natural phenomena of light such as reflection, refraction, and diffraction were recognised.

Christian Huygens launched a significant scientific revolution in the 17th century. He claimed that light is actually a type of energy that travels in waves. He explained it by claiming that any point source of light emits light waves simultaneously in all directions in three dimensions. Under the impact of wave energy, the particles in its environment vibrate on a regular basis. The points of a certain place are present at the same time phase in this sort of propagation. A wavefront is the plane generated by this cluster of points or particles in the same phase.

We will talk about how light is in the form of a wave and what is the contribution of wavefront in it, in the coming paragraphs, which are like this.

What is Wave Front?

The set of all points in a medium where the wave is at the same phase is known as a wavefront. This could be the location of all crests, troughs, or any other phase in between. Wavefronts are useful for depicting the movement of waves in two dimensions. On a wavefront, the distance between two lines is exactly one wavelength. A wavefront is an imaginary surface that represents a wave’s corresponding points vibrating in unison. The set or locus of all the points in the same phase is called a wavefront. Plane wavefronts, spherical wavefronts, and cylindrical wavefronts are the three forms of wavefronts. We’ll go through each of these sorts of wavefronts in detail in the next sections.

Types of Wavefront

The numerous forms of wavefronts are determined by the path taken by particles originating from a source., here some types of wavefront are described, which are as follows;

Spherical wavefront- It’s a circular wavefront generated by a single point of light. Because the locus of all points at the same distance from the point source is the same. Examples can be electromagnetic waves in a vacuum, rings produced by a stone placed in water, etc.

b1

Cylindrical wavefront- A cylindrical wavefront is created when the light source is linear in shape. This is due to the fact that all equidistant points from the linear source are found on the surface of a cylinder. It refers to the rays of light coming out of the lens, when the rays of these lenses fall on the other lens, These rays take the form of a cylinder at the point where they meet.

b2

Plane Wavefront- A plane wavefront is a small piece of a spherical or cylindrical wavefront emerging from a distant source that appears flat. The biggest example of this is the rays

b3

Application of Wavefront

Wavefront technology is mostly utilized in the medical profession to cure eyes. It is used to improve visual acuity as well as shape the cornea. Wavefront technology helps to lessen the negative effects of standard LASIK. LASIK refers to Laser-Assisted In-Situ. Wavefront-guided LASIK procedure uses in-depth, wavefront-generated measurements of how light waves take a trip through your eyes and fall upon the retina, to create a laser treatment that is entirely customised for your eye anatomy and vision correction needs.Astigmatism and hypermetropia, in addition to myopia or nearsightedness, are proving to be more effective in treatment today.

Conclusion

The imaginary wave front represents the matching points of a wave that vibrate in unison. When identical waves from the same source move through a homogeneous medium, their peaks and troughs are in phase at any given time; that is, they have completed equal degrees of their cyclic motion, and all surfaces drawn through all locations of the same phase form a wave front.  As we read here. We also utilise a wavefront as a sensor, which measures wavefront aberration in a coherent signal to represent the optical quality of an optical system. Wavefront techniques are also valuable in areas such as adaptive optics and optical metrology.

faq

Frequently asked questions

Get answers to the most common queries related to the IIT JEE Examination Preparation.

What is the process of wavefront propagation?

Ans: Huygens’ principle provides a precise method for determining how and where waves propagate: Every point o...Read full

What is the process of creating a wavefront?

Ans: When identical waves with the same origin move in a homogeneous medium, ...Read full

What does it mean to have a primary wavefront?

Ans: The wavefronts stretch out in all directions gradually. The primary wavefront is formed when the locus of all t...Read full

What is the best way to get a planar wavefront from a light source?

Ans: None of the choices yields a plane wavefront; however, it can be created artificially by reflection from a mir...Read full

What is the difference between a wavefront and a ray?

Ans: A wavefront is a surface that is always in the same phase. A ray is a perpendicular line drawn at any point on ...Read full

What is a light wavefront?

Ans. The imaginary surface over which an optical wave has a constant phase is known as a wavefront. The form of the...Read full

Ans: Huygens’ principle provides a precise method for determining how and where waves propagate: Every point on a wavefront is a source of wavelets, which expand out in the same forward direction as the wave. The new wavefront is a straight line that runs parallel to all of the wavelets.

Ans: When identical waves with the same origin move in a homogeneous medium, their crests and troughs are in phase at any given moment; that is, they have completed identical fractions of their cyclic motion, and any surface drawn through all the locations with the same phase will be a wave front.

Ans: The wavefronts stretch out in all directions gradually. The primary wavefront is formed when the locus of all the waves in the same phase are brought together to form a spherical waveform. Each point on the primary wavefront generates a secondary wavefront.

Ans: None of the choices yields a plane wavefront; however, it can be created artificially by reflection from a mirror or refraction through a lens.

Ans: A wavefront is a surface that is always in the same phase. A ray is a perpendicular line drawn at any point on the wave front that indicates the wave’s propagation direction.

Ans. The imaginary surface over which an optical wave has a constant phase is known as a wavefront. The form of the wavefront is determined by the shape of the disturbance source. A wavefront always propagates in the same direction as the light beams and never backwards.

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