NCERT Exemplar Solution for Class 7 Science Chapter-15 Light
Light is an essential part of our daily life and helps us see the world around us. The chapter “Light” in Class 7 Science explains how light travels, how objects become visible, and how mirrors form images. Students learn about reflection, regular and irregular reflection, and the role of plane mirrors in everyday activities. The chapter also discusses periscopes, kaleidoscopes, and the importance of sunlight. The NCERT Exemplar Solution for Class 7 Science helps students understand these concepts through practical examples and application-based questions. By practising the NCERT Exemplar Solution for class 7, learners improve their reasoning skills and gain clarity about scientific principles related to light. These NCERT solutions for class 7 are useful for strengthening concepts, preparing for examinations, and developing confidence in solving conceptual and numerical questions related to optics and reflection.
Find the Exercises PDF of NCERT Exemplar Solution for Class 7 Science Chapter-15 Light
Reflection of Light and Formation of Images
One of the main topics covered in this chapter is the reflection of light. Reflection occurs when light rays strike a surface and bounce back. Smooth and shiny surfaces such as mirrors reflect light clearly, allowing us to see images. Students learn that the angle at which light falls on a surface is equal to the angle at which it reflects. This principle is known as the law of reflection.
The chapter explains how plane mirrors form images. The image formed in a plane mirror is upright, virtual, and of the same size as the object. Students also discover that the image appears laterally inverted, meaning the left side appears right and the right side appears left. These ideas are explained through simple activities and diagrams that help students understand the concept easily. Regular reflection occurs on smooth surfaces where reflected rays move in a single direction, while irregular reflection occurs on rough surfaces where rays scatter in different directions. This scattering allows us to see objects around us even when they are not shiny. Understanding these concepts helps students connect scientific principles with real-life experiences such as seeing objects, using mirrors, and observing reflections in water.
The exemplar solutions provide multiple questions based on reflection and image formation. These questions encourage students to analyse situations carefully and apply scientific concepts logically. Step-by-step explanations make learning easier and improve conceptual understanding.
Uses of Mirrors and Multiple Reflections
The chapter also highlights the practical applications of mirrors in daily life. Plane mirrors are commonly used in homes, vehicles, and scientific instruments. Students learn how mirrors help drivers see traffic behind them and how mirrors are used in decoration and optical devices.
Periscopes are introduced as instruments that use two mirrors to help people see objects not directly visible. Submarines and security systems commonly use periscopes. Kaleidoscopes are another interesting device explained in the chapter. They use mirrors and coloured objects to create beautiful patterns through repeated reflections. These examples make the chapter enjoyable and interactive for students. The concept of multiple reflections is also important. When light reflects several times between mirrors, interesting patterns and images are formed. This principle is used in many optical instruments and decorative objects. By learning these applications, students understand how scientific ideas are connected with technology and creativity.
Exemplar questions related to mirrors and reflections improve observation skills and scientific thinking. Students learn how to explain natural phenomena using logical reasoning and practical examples. Such practice also helps them perform better in school examinations.
Importance of Light in Everyday Life
Light plays a vital role in human life, nature, and scientific development. Sunlight is the primary source of natural light and energy on Earth. Without light, plants would not be able to prepare food, and humans would not be able to see objects clearly. The chapter helps students appreciate the importance of light in maintaining life and supporting various activities.
The chapter also explains how reflected light enables us to see objects. Non-luminous objects do not produce their own light but become visible because they reflect light from another source. This concept helps students understand the difference between luminous and non-luminous objects. Learning about light also develops curiosity and observational skills. Students begin noticing reflections, shadows, and image formation in their surroundings. They become more aware of scientific applications in daily life, such as mirrors in vehicles, torches, and optical devices.
The NCERT Exemplar Solution strengthen learning by providing higher-order thinking questions and practical situations. Regular practice helps students improve problem-solving skills and gain confidence in science. This chapter builds a strong foundation for advanced topics related to optics and physics in higher classes.