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# physics

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- CHAPTER 2 : Geometric Optics
  - Specific objectives
  - Introduction
  - Refraction
  - Reflection
  - Optical Instruments

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## Introduction

Optics is the branch of physics that deals with light and its properties, electromagnetic radiation, vision, and systems using or emitting light. Therefore, optics is the part of physics that studies the properties of light.

Light can be defined as a visible electromagnetic wave by the human eye.

Light propagates in a straight line with a speed of C= 3.108 m/s in a vacuum.

The speed of light in a medium is given by :

v = C/n

where n is the refractive index of the medium (n ≥ 1).

n for water = 1,33

n for glass=1,52

n for air =1

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