NCERT Solutions For Class 10 Science Chapter 09 Light- Reflection and Refraction 

Light-Reflection and Refraction is the ninth chapter of Class 10 Science. This chapter covers the concepts of light, focusing on the phenomena of reflection and refraction using the straight-line propagation of light. These fundamental ideas are essential for understanding various optical phenomena observed in nature. This chapter explores the behavior of light with spherical mirrors and its refraction, highlighting their practical applications in real-life scenarios. For solutions of other chapters, refer to NCERT Solutions Class 10 Science.

1.0Class 10 Science Chapter 9 Light Reflection and Refraction Overview

Before getting into the details of NCERT Solutions For Class 10 Science Chapter 9 Light Reflection and Refraction, let's take a brief look at the topics and subtopics covered in this chapter of the NCERT Class 10 Science book.:

Topics covered in this chapter:

• Reflection of Light
• Spherical Mirrors
• Image Formation by Spherical Mirrors
• Representation of Images Formed by Spherical Mirrors Using Ray Diagram 
• Mirror Formula and Magnification
• Refraction of Light 
• Power of Lens 

2.0Download NCERT Solutions for Class 10 Science Light - Reflection and Refraction : Free PDF

This article offers light reflection and refraction class 10 solutions as per ncert. Practicing these solutions will help students develop a strong foundation in Physics and gain clarity on how to approach related problems effectively, ultimately aiding in securing good scores in board exams. For a detailed understanding, students can download the NCERT Class 10 Science Chapter 9 PDF solution below, curated by ALLEN’s experts.

3.0Reflection of Light

Reflection occurs when light strikes a surface and bounces back into the same medium. The laws of reflection state that the angle of incidence equals the angle of reflection.

Spherical Mirrors

• Concave Mirrors: Used in headlights and searchlights.
• Convex Mirrors: Common in rearview mirrors.

4.0Some Basic Terms Related to Spherical Mirrors

5.0Sign Conventions for Spherical Mirrors

6.0Mirror Formula

The relationship between the object distance(u),the image distance(v) and the focal length(f) is given by Mirror Formula.

$\frac{1}{v}+\frac{1}{u}=\frac{1}{f}$

7.0Magnification

• The ratio of height image $(h_2)$ to the height of object $(h_1)$ is called magnification or linear magnification. $m=\frac{h_2}{h_1}$
• Magnification is also related to object distance and image distance. $m=\frac{h_2}{h_1}=-\frac{v}{u}$
• Magnification also expressed as $m=\frac{f}{f-u}=\frac{f-v}{f}$

8.0Refraction Of Light

The phenomenon of change in path of light when it passes from one medium to another is called Refraction.

Laws of Refraction

1. The incident ray, the refracted ray, and the normal at the point of incidence are all contained within a single plane.
2. $\frac{Sini}{Sinr}=Constant(\mu )$

9.0Sign Convention For Spherical lenses

10.0Lens Formula and Magnification

• The relationship between object distance (u) ,image distance (v) and the focal length (f) is given by $\frac{1}{v}-\frac{1}{u}=\frac{1}{f}$
• Magnification-The ratio of height of image ($h_2$) to the height of object ($h_1$)

$m=\frac{h_2}{h_1}=+\frac{v}{u}$

$m=\frac{f}{f+u}=\frac{f-v}{f}$

11.0Power of Lens

• It is the extent of convergence or divergence of light rays. Falling on it. A lens of short focal length bends the light rays more through large angles.
• The power of a lens is defined as the inverse of its focal length. $P=\frac{1}{F}$
• Units is Dioptre(D)
• For convex lens power is positive and for concave lens power is negative.

12.0Benefits of Studying Class 10 Science Chapter 1 Light

• Foundation for Higher Studies: It forms the basis for understanding more complex concepts in Physics, which are covered in higher classes.
• Improved Problem-Solving Skills: Learning about the behavior of light through reflection and refraction enhances analytical and problem-solving abilities.
• Practical Understanding: The concepts are directly applicable to everyday phenomena, such as the formation of images by mirrors and lenses, which helps in understanding the real-world application of Physics.
• Preparation for Competitive Exams: A strong grasp of this chapter is crucial for competitive exams like NTSE, Olympiads, and other entrance tests where basic Physics concepts are tested.
• Enhanced Conceptual Clarity: This chapter helps in building a clear understanding of the nature and properties of light, which is essential for mastering more advanced topics in optics.
• Boosts Academic Performance: A thorough understanding of this chapter can lead to better performance in school exams, as it is an important part of the curriculum.
• Stimulates Curiosity: It encourages students to explore and experiment with light, fostering a scientific temperament and curiosity about natural phenomena.