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Welcome to eGyanKosh, your comprehensive resource for educational materials designed to enhance your learning experience. In this Unit-4 study guide, we delve into the fascinating topic of images formed by concave mirrors and convex lenses, providing you with a thorough understanding of the underlying concepts and principles. Whether you’re preparing for exams or seeking to reinforce your knowledge, this resource is tailored to support your academic journey at IGNOU in 2025. Best of all, you can access and download this study material for free, making it easier than ever to explore the world of optics and image formation. Join us as we unlock the intricacies of these optical devices and their applications in real-world scenarios!