SANKALP EDUCATION
CLASS - XII
SANKALP EDUCATION
PHYSICS
UNIT - 6 [PART - 1]
OPTICS
Normal
Incident light ( ) Reflected light
( ) ( )
SANKALP EDUCATION i
r
O
Incident point Reflected surface
( ) ( )
Student's Name :
SANKALP EDUCATION
Reg. No...............
Topic : Reflection of light
Pramod Kumar Singh
Mob. No. : 9709149520
, OPTICS
Light ( ) - The visible part of the eletromagnetic wave is called light.
Optics ( )-
The branch of physics which deals with the study of nature and its properties of light is called optics.
SANKALP EDUCATION Optics ( )
Geometrical optics or ray optics Physical optics or wave optics
Ex - Light ( ) Light ( )
Ex -
1. Geometrical optics or ray optics ( )–
The branch of optics which deals with the study of particles nature of light is called geometrical optics or ray optics.
2. Physical optics or wave optics ( )–
The branch of optics which deals with the study of wave nature of light is called physical optics or wave optics.
Q.
SANKALP EDUCATION
What is reflection of light ? State the law of reflection of light.
Ans. The phenomenon of change in the path of light without any change in medium is called reflection of light.
According to the laws of reflection of light – Normal
incident light reflected light
( )
( ) ( )
(i) The angle of incident(i) is always equal to the
angle of reflection(r) r
i
O
That is, ( ) i = r incident point reflected surface
(ii) The incident ray, the reflected ray and the normal ( ) ( )
at the point of incidence all lie in the same plane. Where ( ),
SANKALP EDUCATION
i = angle of incident ( )
r = angle of reflection ( )
Normal ( )-
The line which is perpendicular to any surface is called normal at that surface.
Reflecting surface or plane ( )-
The surface which reflects the light is called reflecting surface or plane.
Page No. - 1
CLASS - XII
SANKALP EDUCATION
PHYSICS
UNIT - 6 [PART - 1]
OPTICS
Normal
Incident light ( ) Reflected light
( ) ( )
SANKALP EDUCATION i
r
O
Incident point Reflected surface
( ) ( )
Student's Name :
SANKALP EDUCATION
Reg. No...............
Topic : Reflection of light
Pramod Kumar Singh
Mob. No. : 9709149520
, OPTICS
Light ( ) - The visible part of the eletromagnetic wave is called light.
Optics ( )-
The branch of physics which deals with the study of nature and its properties of light is called optics.
SANKALP EDUCATION Optics ( )
Geometrical optics or ray optics Physical optics or wave optics
Ex - Light ( ) Light ( )
Ex -
1. Geometrical optics or ray optics ( )–
The branch of optics which deals with the study of particles nature of light is called geometrical optics or ray optics.
2. Physical optics or wave optics ( )–
The branch of optics which deals with the study of wave nature of light is called physical optics or wave optics.
Q.
SANKALP EDUCATION
What is reflection of light ? State the law of reflection of light.
Ans. The phenomenon of change in the path of light without any change in medium is called reflection of light.
According to the laws of reflection of light – Normal
incident light reflected light
( )
( ) ( )
(i) The angle of incident(i) is always equal to the
angle of reflection(r) r
i
O
That is, ( ) i = r incident point reflected surface
(ii) The incident ray, the reflected ray and the normal ( ) ( )
at the point of incidence all lie in the same plane. Where ( ),
SANKALP EDUCATION
i = angle of incident ( )
r = angle of reflection ( )
Normal ( )-
The line which is perpendicular to any surface is called normal at that surface.
Reflecting surface or plane ( )-
The surface which reflects the light is called reflecting surface or plane.
Page No. - 1
