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# NCERT Solutions for Class 12 Physics Chapter 10 – Wave Optics

NCERT Solutions for Class 12 Physics Chapter 10 – Wave Optics should be referred to anytime you have a doubt in the chapter. Topics like angle of diffraction, Young’s double-slit experiment, frequency of refracted light, wavelength, Huygens Principle, the polarization of light etc. are thoroughly covered in these NCERT Solutions. You will be able to revise the chapter easily with these solutions.

There are 21 questions in NCERT Class 12 Physics Chapter 10. All of these questions are based on the fundamentals of the chapter. There are short answer questions, descriptive questions, analytical questions, numerical problems and reasoning questions in the exercise. These questions will give you a thorough practice of concepts like the refractive index, Brewster angle, Young’s Double-slit experiment, Doppler formula, Diffraction etc.

The NCERT Solutions for Class 12 Physics Chapter 10 Solutions are prepared by experts at Instasolv so you can easily rely on them. They abide by the CBSE guidelines and exam pattern and include all the explanations that are not present in your NCERT textbooks.

## Important Topics for NCERT Solutions for Class 12 Physics Chapter 10 – Wave Optics

Huygens Principle

Physics NCERT Class 12 Chapter 10 will introduce you to the concept of Huygen’s Principle which informs that every point on a wavefront is a potential source of the secondary waves. It is these waves which later add on to give a wavefront. You will learn the detailed mechanism of this phenomenon along with various equations and examples related to it.

The construction of Huygens principle also explains that the new wavefront is actually a forward envelope of the secondary waves. Whenever the speed of light tends to be independent of direction, the shape of the secondary waves comes out to be spherical.  The rays then become perpendicular to both the wavefront and the time of travel of the wave becomes the same as it is when measured along any other ray. It is this principle which accounts for the formation of the laws of reflection and refraction.

Polarization by Reflection

When a ray of polarized light is incident on the boundary which lies between any two mediums which are transparent in nature the reflected light tends to get polarized. The light is polarized in such a way that its electric vector becomes perpendicular to the plane of incidence, and the reflected and the refracted light make a right angle with each other at the same time. The angle of incidence in this situation is termed as the Brewster’s angle and it is related to the refractive index of the medium which is denser in nature.

Principle of Superposition of Waves

In this chapter, you will also come across the concept of the Principle of Superposition of Waves. This principle applies itself wherever there are two or more sources of light which are illuminating at the very same point. When the intensity of the light due to these sources is brought into consideration, the occurrence of an interference term is observed. However, this interference term is only essential in case if it has an average which is anything but null. This condition occurs only when the source of the light has a similar frequency and a stable phase difference.

## Exercise Discussion of NCERT Solutions for Class 12 Physics Chapter 10 – Wave Optics

• The exercise of NCERT Class 12 Physics Chapter 10 begins with a question where you need to find wavelength, the frequency and the speed of the light which has been refracted and the light which has been reflected. You are given the value of wavelength of the incident light. The question requires you apply the simple formulas of frequency and speed and the basic concepts about the reflected and refracted light.
• The next question, 10.2 requires you to support your answer with diagrams and involve theory-based short answers. There are pretty simple questions in the starting of the exercise which will help you build confidence for the rest of the complex questions.
• Question 10.6 provides you the wavelength of two beams of light which are being used to obtain the interference fringes in Young’s double-slit experiment.  You are required to find the distance amongst the fringes depending upon the situations which are given in the question. Such questions test your observational and analytical skills, and are therefore important from an exam point of view.
• Question 10.9 is also an important question and it requires you to find the angular width of a light fringe depending on the situations given in the question.
• There are theory-based questions too, like question 10.17 where you are given statements and you have to justify them and certain situations according to which you have to explain your answers.
• Question 10.20 is also a theory-based question where you have to justify statements which have been derived from the chapter or are based on the concepts from it.
• Overall the exercise is an amalgam of all the major topics of the chapter and provides a very engaging medium to practice, revise and prepare for your CBSE exams.

## Benefits of NCERT Solutions for Chapter 10 – Wave Optics by Instasolv

Practising NCERT Solutions for class 12 Chapter 10 will help you understand everything related to the chapter. With these solutions, you can prepare well for your competitive exams as well like JEE and NEET. We have included all the exercise solutions so you will not have to look anywhere else for solving your queries. With Instasolv, you can learn independently at your own pace.

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