Xam Idea Class 12 Physics Chapter 10 Solutions: Wave Optics

Xam Idea Class 12 Physics Solutions for Chapter 10 ‘Wave Optics’ have been crafted especially for preparing for CBSE Class 12 board exams. After reading this chapter, you will have an in-depth knowledge of mechanical oscillation, electrical oscillation, elastic waves, and electromagnetic waves, and you will be able to solve the related questions. All solutions are presented in a quite detailed manner which will address every aspect of the chapter helping you practice for Class 12 board exams.

Xam Idea Class 12 Physics Solutions for Optics consist of 84 questions in total that are divided into four categories. These categories are very short answer types, short answer type questions (type I and II), and long answers type questions. The problems are focused on the following monochromatic light travelling in a different medium, coherent sources concerning interference of light. You will also learn the concept of rays, optics, the wavelength of light, types of the wavefront, the effect of fringes, and polarized light.

With Instasolv, you can identify the optimal and easy solutions for Xam Idea Class 12 physics Solutions Chapter 10. The solutions formulated by our highly qualified and experienced professionals will help you better understand the concepts and resolve your doubts confidently. Our Xam Idea solutions are delivered in a very convenient-to-understand and standardized structure.

Important Topics of Xam Idea Solutions for Class 12 Physics Chapter 10: Wave Optics

  • Wavefront: It is the constant locus of all the particles of the fluid that vibrate at any moment in the same period of oscillation.
  • Based on the form of the light source, the wavefront has various forms: Plane, Spherical and
  • Rays: Rays are beams perpendicular to the wavefront in the course of wave propagation.
  • Time Spent: The period spent by light to pass from one wavefront to another is considered a period is taken by a photon.
  • Huygens’ Principle:

As per Huygens, every location on the given wavefront (known as primary wavefront) serves as a new source of disruption, termed the secondary wavelet, which moves in all directions at light speed within a medium.

  • Concept of the Construction of Huygens:
  • It is grounded on the theory that any point upon a wavefront is a secondary source of the wavefront.
  • The boundary of such wavefronts, that is, the surface tangent of any of the secondary wavefront, provides a fresh wavefront.
  • Snell’s Law based on Refraction:

1μ2 = c1/c2 = Speed of Light in First Medium/ Speed of Light in Second Medium

  • Plane Waves Reflection Use the Huygens Principle: the law of reflection was,i= r) can be taken from wave theory

  • Plane Waves Refraction Using the Huygens Principle: Snell’s law of refraction

It can be obtained from wave theory. (In this v1 and v2 are the velocity of light in medium 1 and 2 having             a  refractive index respectively).

Frequency-Speed relationship: Frequency remains the same as light as it passes through one medium to another. The velocity v of the wave is provided by

Here, λ = Wavelength of a wave,                     

T(=1/v) = Oscillation period.

  • Doppler Effect: Where there is a relative motion between both the source and the spectator, the perceived frequency of light obtained by the spectator is different from the actual frequency produced by the light source. This phenomenon is termed as the Doppler effect of light. The impact can be used to determine the velocity of an emerging or receding body.
  • Change in Frequency: In this source going further from the spectator, and for the source heading towards the spectator, Frequency transition is is.
  • Now finally,   
  • Coherent sources: Two light sources that consistently produce light waves with the same frequency (or wavelength) having negligible or persistent phase gaps in them are considered coherent sources.
  • Incoherent sources: Two light sources that never produce light waves with a continuous phase gap are referred to as incompatible sources.
  • Complete Intensity “I” is not just the total of individual intensities I1 and I2 based on two sources, but encompasses the concept of interference-
  • The interference word measured across a range of periods equals to zero, if
    • Sources having various frequencies or
    • Sources have an equal frequency, but there is no predictable phase gap.

    For that kind of coherent sources –

  • Diffraction by single slit:

  • A single-slit diffraction pattern represents the highest central, zero intensity at angular separation.
  • Angular spread of the central maxima

Central maxima width:                                                                 

Here, D = slit distance from screen, d = slit width.

  • Polarization

If the wave’s vibration is distributed in just one direction within a plane perpendicular to the path of propagation, the wave is claimed to be polarized or the plane-polarized.

  • Polarization through reflection (Brewster’s Law): When polarized light appears on a translucent surface of a substance at a polarizing angle, the reflected light becomes polarized with an electrical vector perpendicular to the plane axis of incidence as the refracted and reflected rays form a right angle with one another.

  • Polarization through Scattering:

Light is dispersed as a particle with uniform thickness reaches its wavelength. The dispersion of sunlight by dust particles is an indicator of dispersion polarization.

Exercise Discussion of Xam Idea Class 12 Physics Solutions, Chapter 10. Wave Optics

This chapter consists of 84 questions in total and has been divided into four categories. Each category is further divided into two parts: PYQ (past years questions) and OIQ (objective inventory questionnaires).

Very Short Answers Type Questions:

  • It includes a total of 31 problems out of which 14 problems come underneath the PYQ segment and the rest 17 problems come under the OIQ segment. It deals with a basic problem, that is straightforward and easy to answer, and can only be resolved by implementing formulas.
  • Questions like find the intensity of light transmitted through Polaroid, monochromatic light travelling through a different medium. Theoretical questions based on the phenomena of interference, waves, and ray optics.

Short Answer Type Questions (Type I):

  • It is composed of 9 problems in total, 3 problems conform to the PYQ category, and 6 problems pertain to the OIQ category.
  • It includes the application of Brewster’s law in finding refractive angles, resolving limits of a microscope, and diagrammatic representation of the variation of intensity of light.

Short Answer Type Questions (Type II):

  • It consists of a total of 30 problems from which 23 problems belong to the PYQ category and 7 belongs to the OIQ category.
  • Phenomena based on convex lens, reflection by a concave lens, spherical wavefront, plane wavefront, light diverging from a point source, and aperture of an objective lens are some important questions in this section.

Long Answer Type Questions:

  • This segment includes 14 problems. This segment deals with the most complicated and manipulated problems of the chapter that can’t be fixed only by implementing a formula.
  • The problems answered under this segment covers Huygens’s principle and construction of secondary wavelengths. Few questions will ask you to prove Snell’s law of refraction using Huygens’s principle.

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  • Our Xam Idea solutions are the best option for a quick understanding of the concepts of the chapter.
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  • You get all of the crucial suggestions for addressing complicated questions in a quite comprehensive manner.
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