Refraction of light is the phenomenon in which the path of light changes when it travels from one medium to another due to a change in its speed. This concept helps us understand many natural and practical effects such as the bending of a pencil in water, formation of images by lenses, and working of optical instruments. For NDA and CDS aspirants, refraction forms the foundation for important topics like refractive index, Snell’s laws, and optical devices.
Brief Overview
In refraction, light bends towards the normal when it enters a denser medium and away from the normal when it moves into a rarer medium. The extent of bending depends on the refractive indices of the two media. Snell’s laws quantitatively explain this behavior and are frequently used to solve numerical problems in NDA and CDS exams. Understanding refraction is essential before moving on to lenses, prisms, and total internal reflection.
Relevance for NDA / CDS 1 2026 Exam
- Refraction is a high-weightage topic in Physics.
- Direct theory questions and numerical problems are commonly asked.
- Concepts like refractive index, bending of light, and applications in daily life are frequently tested.
- Strong basics help in solving questions quickly and accurately in the exam.
Conclusion
Refraction of light is a fundamental concept in optics and plays a crucial role in understanding advanced topics. For NDA and CDS 1 2026 aspirants, mastering this chapter strengthens problem-solving skills and improves performance in the Physics section. Regular practice of definitions, laws, and numericals will ensure confidence in the exam.
