NCERT Solutions Class 10 Science - Chapter 9 Light Reflection and Refraction - PDF Download

NCERT solutions for Chapter 9, Light Reflection and Refraction are very important for achieving a good score in the class 10 science exam. NCERT solutions for chapter 9, light reflection and refraction will help students in preparing for the exam and in building a solid foundation in the subject. The NCERT solutions for chapter 9, Light Reflection and Refraction have been prepared and reviewed by the most senior and experienced faculties of eSaral, so you don’t need to worry about their credibility. NCERT solutions help students in understanding certain topics that are likely to appear in the science board exam.

Chapter 9 of class 10 science is mainly concerned with reflection of light and refraction of light. The main topics covered in this chapter include mirrors, magnification, refraction, and power of a lens. To make it easier to understand, the light reflection and refraction solutions contain diagrams, logical problems, and detailed content in easy to understand language.

Reflection of light refers to light waves that bounce off the surfaces of objects that are not able to absorb radiation. For instance, the surface of a pool will show the clarity of the surrounding objects when it is still. However, all the rays will scatter once a rock is dropped inside the pool, which prevents systematic reflection of light.

NCERT Solutions for Class 10 Science Chapter 9 Topics

9.1 Reflection of Light: Light waves travel in different directions when they bounce off of a surface. This is called "reflection" and it's governed by laws of reflection. Basically, when light hits something that's reflective, like a mirror or a smooth polished surface, it bounces off of it.

9.2 Spherical Mirrors: A spherical mirror is a type of mirror that has a curved surface. It can either focus light rays on one side of the mirror or away from it, depending on how the mirror is curved. There are basically two kinds of spherical mirrors - concave and convex. These two types of mirrors have different shape and characteristics, which means they have different behaviors when it comes to reflecting and focusing light.

Subtopics covered in the section 9.2 Spherical Mirrors:

9.2.1 Image Formation by Spherical Mirrors

9.2.2 Representation of Images Formed by Spherical Mirrors Using Ray Diagrams

9.2.3 Sign Convention for Reflection by Spherical Mirrors

9.2.4 Mirror Formula and Magnification

9.3 Refraction of Light: Light rays bend as they travel from one transparent medium to another. This happens because the speed of light changes when it passes between two different media with different optical densities. This changes the speed of light, which changes the direction of light.

Subtopics covered in the section 9.3 Refraction of Light: 

9.3.1 Refraction through a Rectangular Glass Slab

9.3.2 The Refractive Index

9.3.3 Refraction by Spherical Lenses

9.3.4 Image Formation by Lenses

9.3.5 Image Formation in Lenses Using Ray Diagrams

9.3.6 Sign Convention for Spherical Lenses

9.3.7 Lens Formula and Magnification

9.3.8 Power of a Lens

Key Points of Class 10 Science Chapter 9 

• When light hits the surface of something, it bounces back. The law of reflection states that the incident, reflected, and normal rays of light are all in the same plane, and the angle of incidence is the same as the angle of reflection.

• Concave mirrors reflect light inwards, making images that are either real or virtual, bigger or smaller depending on where the object is. On the other hand, convex mirrors reflect light outwards, always making virtual, smaller images.

• Refraction occurs when light of varying optical densities passes through a medium at a different speed than the speed at which it passes through another medium.

• When light hits a prism, it refracts twice at each of the two sides of the prism. Different colors of white light absorb different amounts of refraction, resulting in dispersion and a spectrum.

• A prism is one of the most common devices used to show dispersion. Basically, it separates light into its different colors because different wavelengths of light reflect off different angles.

• The Earth’s atmosphere reflects light, making objects appear higher up in the sky (apparent positions). Because of atmospheric refraction, you can see things like the sunrise and sunset just before the sun hits the horizon.

• Refraction causes an object that is immersed in a clear medium to appear to be lying at a lower depth than it actually is.

• Total internal reflection happens when light traveling through a denser medium hits the boundary with a denser medium at an angle above the critical angle. This is the foundation of optical fibers and optical illusions.

Importance of Downloading the PDF of NCERT Solutions Class 10 Science Chapter 9 Light - Reflection and Refraction

NCERT solutions is a great tool for students to achieve maximum marks. To achieve maximum marks, students need to have a good knowledge of the concepts in this chapter which is adequately covered by NCERT solutions.

The main advantages of NCERT Chapter 9 Science NCERT Solutions are:

• The chapter 9 science NCERT Solutions are provided by eSaral faculties who are experts in their field and have a good experience. The solutions provided by them are precise and will help you to get good marks on the tests.

• The solutions for various questions in the chapter are explained through charts and viable diagrams for easy understanding by students.

• The solutions have been designed and created with the main objective of helping students to get high marks.

• The solutions are simple and explain step by step processes to help students to have a strong knowledge of the concepts.

• The language used in the chapter is clear and understandable for all.

Frequently Asked Questions

Question 1: What is light reflection?

Answer 1: Light reflection is the phenomenon of light waves reflecting off an object's surface and travelling in a different direction than the angle at which the light hits the object.

Question 2: What is total internal reflection? 

Answer 2: Total internal reflection occurs when light hits the boundary at more than the critical angle when traveling from a dense medium to a dense medium. In this situation, all light is reflected back to the denser medium and no light is refracted to the less dense medium.