Understanding the concept of light is essential in science as it plays a crucial role in our daily lives. In Class 7, students explore the properties and behavior of light through various experiments and observations.

- Light is a form of energy that enables us to see objects.
- It travels in straight lines and can be reflected, refracted, or absorbed.
- The speed of light is 3 x 10^8 meters per second in a vacuum.

- When light bounces off a surface, it is called reflection.
- The angle of incidence is equal to the angle of reflection.
- Mirrors are smooth surfaces that reflect light in a predictable manner.

- Refraction occurs when light passes from one medium to another, causing it to change direction.
- The speed of light changes in different mediums, leading to refraction.
- Lenses use refraction to focus light and form images.

- Dispersion is the separation of white light into its component colors (spectrum).
- This can be observed in a prism where light is refracted at different angles based on its wavelength.
By studying the properties and behavior of light in Chapter 11, students gain a deeper understanding of how light interacts with the world around us. The knowledge acquired in this chapter forms the foundation for more advanced concepts in optics and light-based technologies.