Newtextbook Class 9 Refraction of light / Class 9 newtextbook physics class chapter 1

Refraction of light class 9 physics newtextbook PART 1 :    • Refraction of light class 9  physics newte...   In this video am teaching what is refraction ? what are optical density ? what is refractive index? how refractive index related to refraction ? when light ray travel from rarer to denser medium what will happen ? #newgenmath #physicsclass9 #education #class9physicschapter1#newgenmathphysicsclass