Reflection and Refraction of Light — Chapter Summary
NIOS · Class 12 · Physics
Summary of Reflection and Refraction of Light for NIOS Class 12 Physics. Part of the NIOS Class 12 Physics syllabus.
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Overview
Light is the medium through which we visually experience the world around us. This chapter explores two fundamental phenomena — reflection and refraction — that govern how light behaves when it encounters different surfaces and media. When light hits a mirror, it bounces back (reflection). When ligh
Key Concepts
Two fundamental laws govern reflection
Two fundamental laws govern reflection of light: (1) The incident ray, reflected ray, and normal to the surface at the point of incidence all lie in t
A spherical mirror is a part
A spherical mirror is a part of a hollow sphere. Important terms: (1) Pole (O): the midpoint of the reflecting surface. (2) Centre of Curvature (C): c
The New Cartesian Sign Convention
The New Cartesian Sign Convention is used throughout optics. Rules: (1) All distances are measured from the pole (O) of the mirror or the optical cent
The mirror formula relates object distance
The mirror formula relates object distance (u), image distance (v), and focal length (f): 1/f = 1/v + 1/u. This formula is universal — it works for al
When light travels from medium 1
When light travels from medium 1 to medium 2, it bends at the interface. Snell's Law states: sin i / sin r = μ₁₂, where i is the angle of incidence an
Learning Objectives
- Understand and apply the laws of reflection at curved (spherical) surfaces
- Establish the relationship between focal length and radius of curvature: f = R/2
- Use the sign convention consistently for spherical mirrors and lenses
- Derive and apply the mirror formula: 1/f = 1/v + 1/u
- State and apply Snell's law of refraction: sin i / sin r = μ₁₂
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