Chapter 9 Ray Optics and instrument Class12 Physic, Chapter9 Ray Optics & Instrument | Page 3

( vi ) Real Image The image obtained by the real meeting of light rays , is called a real image . Real image can be obtained on a screen . Real image is inverted .
( vii ) Virtual Image The image obtained when light rays are not really meeting but appears to meet only , is called a virtual image .
Reflection of Light The rebouncing back of light rays into the same medium on striking a highly polished surface such as a mirror , is called reflection of light .
Laws of Reflection
There are two laws of reflection .
( i ) The incident ray , the reflected ray and the normal at the point of incidence all three lie in the same plane .
( ii ) The angle of incidence ( i ) is always equal to the angle of reflection ( r ).
Types of Reflection
( i ) Regular Reflection When a parallel beam of reflected light rays is obtained for a parallel beam of incident light rays after reflection from a plane reflecting reflection is called regular reflection .