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DC Pandey Refraction of Light Solutions

DC Pandey Optics and Modern Physics Solutions Chapter 26 ‘Refraction of Light’ is an ideal study material for JEE Physics preparation. These DC Pandey Physics Book Solutions are created with the purpose of guiding you to easily solve the exercise questions of this chapter. Refraction of light is an essential topic in geometric optics in which you will learn about the phenomenon of bending of light in different mediums. The topics covered in this chapter are the two laws of refraction, single refraction from a plane surface, refraction due to a glass slab, and refraction from a spherical surface. This chapter also covers in detail, the spherical lenses and the determination of their focal points.

We have provided DC Pandey Optics and Modern Physics Refraction of Light Solutions exercise-wise. This includes all the 186 questions of the chapter. The questions are arranged in two levels according to the difficulty and complexity of the problems. The questions include topics such as finding frequency, velocity and wavelength of light as it travels from one medium to another, finding the refractive index and the nature of image formed due to refraction. Solving these questions will make you acquainted with the pattern of questions asked in competitive entrance exams like JEE and NEET.

At Instasolv, we provide you with the easiest methods to approach a problem in Optics and Modern Physics by DC Pandey Solutions. The answers on our platform strictly adhere to the latest Physics syllabus for JEE and are updated periodically. We guarantee 100% accurate solutions. All the questions are answered in a step by step fashion to make sure you do not miss out on any concepts. You can easily use DC Pandey Refraction of Light solutions for Class 12. 

Important Topics in DC Pandey Optics and Modern Physics Solutions Chapter 27: Refraction of Light

Refraction of Light

Assuming a light wave that is moving across a medium encounters a change in the optical density of the medium, we will find that the light wave bends either towards or away from the normal of the surface.

Laws of Refraction

Two laws of refraction hold true in the geometric optics, which are mentioned as follows:

  1. The three rays, that is, the incident ray, refracted ray, and the normal to the boundary of the medium at the point of incidence are all coplanar (lie on the same plane)
  2. Snell’s Law of Refraction: According to the theory of this law, it was found that the ratio of the sine of the angle of incidence is to the sine of the angle of refraction was a constant. This constant is termed as the refractive index of the new medium into which the ray traverses.

General Concepts in Refractive Index

  • Mathematical representation of Snell’s Law: If the angle of coincidence is i1 and the angle of refraction in the second medium is i2 then, according to the law, 

  • If we assume medium 1 as a vacuum then the refractive index is termed as the absolute refractive index of the second medium and is denoted by 2 or simply .
  • Snell’s Law can also be stated as,

  • It was found that when a light ray passes from rare to a denser medium, the phenomenon of bending takes place towards the normal whereas when it passes from a denser to a rarer medium, it is known to bend away from the normal.
  • Refractive Index happens to be dimensionless quantity. Consider a given material, the refractive index will be the ratio of the velocity of light in a vacuum (say c) to the velocity of light in the medium (say v). If the refractive index for a medium 2 with respect to the 1st medium is represented by 1𝛍2, then it is given by the following formula:

Single Refraction from a Plane Surface and A Glass Slab

In this section, we discuss in detail, the two cases in the phenomenon of refraction, which is a ray passing from a denser medium to a rarer medium and vice versa.

While studying refraction due to a glass slab, we will find a parallel shift, known as in the direction of motion of the light wave. This happens due to double refraction from plane surfaces.

Lateral Magnification due to Refraction from a Spherical Surface

If the height of the object of study is ho and the height of the image formed by a spherical lens is hi, a ray is passing through the centre of curvature unaltered and the path of the ray is found by the snell’s law, then assuming paraxial approximation,

Exercise Discussion for DC Pandey Optics and Modern Physics Solutions Chapter 27: Refraction of Light

  1. Introductory exercises 27.1 and 27.2 comprises questions 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 refractive indices, wavelength and frequencies of light waves, refraction from the spherical lens and single and double refraction from the plane surfaces.

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