The class on the topic of light in Class 7 Science is typically designed for students in the 7th grade. So, students who are in the 7th grade or around that age would be the ones expected to attend this class.

In this class, you will learn about the fundamental concepts and properties of light. Some of the key topics covered in a Class 7 Science class on light may include:

1. Nature of Light: Understanding light as a form of electromagnetic radiation and its characteristics.

2. Reflection: Exploring how light reflects off surfaces, including the laws of reflection and concepts like incident ray, reflected ray, and normal.

3. Refraction: Studying the bending of light as it passes from one medium to another, focusing on the laws of refraction and concepts like incident ray, refracted ray, and angle of refraction.

4. Lenses: Introduction to the basic properties of lenses, including converging and diverging lenses, and their use in correcting vision.

5. Prism: Learning about the dispersion of light by a prism and how it forms a spectrum.

6. Optical Instruments: Understanding how optical instruments like mirrors and lenses are used in devices such as microscopes and telescopes.

The specific curriculum and depth of the topics covered may vary depending on the educational board and school.