DC Pandey Reflection of Light Solutions

DC Pandey Optics and Modern Physics Solutions for Chapter 26 ‘Reflection of Light’ are prepared with the intent to aid you in solving the exercise questions of this chapter effortlessly. The important topics that are covered in these DC Pandey Solutions include an introduction to the branch of physics called optics. You will also get to learn about the dual nature of light as a wave-particle, a step ahead from geometric optics. Few general points in geometric optics have also been covered in the solutions. This chapter is important to build a strong base in modern physics to help you increase your marks significantly.

Our solutions for DC Pandey Optics and Modern Physics Reflection of Light chapter include 81 questions divided into 2 exercises, namely introductory exercises and JEE corner. The questions are arranged in level 1 and level 2 according to the difficulty and complexity of the problems. Solving these questions will make you acquainted with the pattern of questions asked in competitive entrance exams. There are questions. It is advised that you practice the exercise questions in this chapter consistently with regular revision.

At Instasolv, we provide you with the easiest methods to approach a problem in Optics and Modern Physics. You can easily score a good rank in the entrance exams of your choice by using Instasolv as your source of reference to solve the exercise questions in DC Pandey Physics book. The answers to the exercise questions are written by expert faculties to make sure they comply with the latest JEE curriculum. The Instasolv experts provide you with 100% accurate solutions. Each and every question of both levels in the exercises are covered with precision. 

Important Topics in DC Optics and Modern Physics Solutions Chapter 26: Reflection of Light


The subject under which we study how light and other electromagnetic waves behave under different situations is termed as optics. The nature of light had been a matter of discussion in physics for centuries. The wavelengths of electromagnetic radiations ranging from 4000 Angstrom to 7000 Angstrom is termed as visible light, as it is sensitive to the human eye. 

The two major questions covered in this chapter are: 

  1. The nature of light, and 2. The interaction of light waves in different mediums and in different situations. 

When the wavelength of light is negligible with respect to the dimensions of the devices under consideration or different mediums, the rules of geometric optics follow. Whereas in physical optics, we learn about the wave nature of light, i.e. when the wavelength of light is comparable to the aperture of devices of study.

The Nature of Light

Initially, there was a long-lasting debate on the particle and wave nature of light. Newton established the laws of reflection and refraction using the principles of particle nature of light. 

While Christian Huygens and Robert Hooke propagated the wave nature of light and were also able to explain the laws of reflection and refraction using it. 

However, Newton rejected the idea of wave nature. In 1801, Thomas Young introduced the idea of interference of light waves and electromagnetic waves through his double-slit experiment. 

Later, many scientists proved the wave theory mathematically as well. With Albert Einstein reviving the particle nature of light, it was accepted that light exhibits both the particle nature as well as wave nature.

Electromagnetic Waves

Maxwell proved that electric and magnetic waves moving with velocity v which were time-dependent satisfied the wave equations mentioned in the previous chapter and can be depicted as following Maxwell’ wave equations:

Thus, the speed of electromagnetic waves by comparing the above equations can be given as

The Refractive index is the ratio of light in vacuum and the speed of light in a given medium, v.

Concepts in Geometric Optics

  1. The optical instrument is assumed on the left-hand side and the incident light waves travel from the right to left-hand direction while studying geometric optics.
  2. Silver or a polished surface reflects the incident ray of light. If no such obstruction occurs, then the light ray moves in a straight line.
  3. The direction along the incident ray is denoted positive while opposite to the incident light ray is denoted negative.
  4. The object distance is denoted by u and the distance of the image from the aperture of the optical instrument is denoted by v.
  5. A real object is formed when the light rays intersect for real. A virtual image is formed when the light waves appear to be intersecting when extended.

Reflection of Light

When the electromagnetic waves strike an obstruction, new waves are produced after the strike, moving away from the obstruction. The incident angle i with respect to the normal on the surface of the barrier is found to be equal to the reflected angle and all the three lines, that is, the incident ray reflected ray and normal lie on the same plane.

These laws of reflection hold true for the reflection of light waves as well. This chapter will cover questions on reflection from plane mirrors and curved surfaces in detail.

Exercise Discussion for DC Pandey Optics and Modern Physics Solutions Chapter 26: Reflection of Light

  1. Introductory exercises 26.1 and 26.2 comprises 2 and 3 questions respectively in which you will be required to calculate the refractive index of different mediums, wavelength and frequency of waves, and the expressions for electric or magnetic field vector for a given electromagnetic wave
  2. The next set of exercises is for JEE preparation that comprises of 2 levels of subjective questions and multiple-choice questions. The topics covered in the questions of each section include wave equations, refractive indices, wavelength and frequencies of light waves, reflection from spherical mirrors and lens.

Why Use DC Pandey Optics and Modern Physics Solutions Chapter 26: Reflection of Light by Instasolv?

  • The experienced faculties at Instasolv have used easy language to formulate DC Pandey Optics and Modern Physics Solutions for Reflection of Light. 
  • These solutions are compliant to the latest Physics syllabus for JEE as well as Class 11 and Class 12 Physics exams, therefore, you can use them for homework purpose or revision before exams. 
  • The solutions are arranged in such a manner that they are ideal for self-study.
  • Instasolv intends to minimise your time in struggling with doubts which makes us your reliable source of reference.