Chapter 12 - Light And Human Eye

LightThe bouncing back of light from any surface is called reflection of light. TYPES OF REFLECTION-Regular reflection = The reflection is caused by a smooth, shiny or highly polished surface is called regular reflection. Irregular reflection = The reflection caused by a rough or uneven surface is LA The ray of light which strikes the surface is called incident ray.The ray of light that goes into another direction after striking the surface is called the reflected ray.The line drawn perpendicular to the surface of the mirror at the point where the ray of light strikes is called normal.The angle formed by the incident ray with the normal is called the angle of incidence.The angle formed by the reflected ray with the normal is called the angle of reflection. LAWS OF REFLECTION-The angle of Incidence and the angle of reflection are always equal.The Incident ray, reflected ray and normal lie on the same plane. TYPES OF IMAGES- Real Image = It is always obtained on a screen. It is always inverted. Virtual Image = It cannot be obtained on a screen. It is always erect but is laterally inverted.The