CBSE Class 12 Physics Reflection from Curved Surface Theory and Examples

CBSE Class 12 Physics Reflection from Curved Surface Theory and Examples. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

1. TYPES OF CURVED MIRRORS
1.1 A curve mirror is a smooth reflecting part (in any shape) of a symmetrical curved surface such as paraboloidal, ellipsoidal, cylindrical or spherical.
Note : Here we will discuss only on spherical mirrors.

1.2 CONCAVE MIRROR :
If the reflection takes place from the inner surface of a spherical mirror, then the mirror is called concave mirror.

1.3 CONVEX MIRROR :
If the outer surface of the spherical mirror acts as a reflector then the mirror is called convex mirror.

2. TERMS RELATED TO SPHERICAL MIRROR
2.1 CENTRE OF CURVATURE (C) :

2.5 FOCUS (F) :
When a narrow beam of rays of light , parallel to the principal axis and close to it ( known as paraxial rays ), is incident on the surface of a mirror, the reflected beam is found to converge (concave mirror) or appear to diverge (convex mirror) from a point on the principal axis. This point is called focus.

2.6 FOCAL LENGTH (F) :
It is the distance between the pole and the principal focus. For spherical mirrors, f = R/2

DERIVATION

3.2 Distances measured to the right of the pole are taken as positive.
3.3 Distances above the principal axis are taken as positive.
3.4 Angles measured from the normal in the anticlockwise sense are positive.

4. MIRROR FORMULAE
4.1 In terms of Cartesian sign convention mirror formula may be expressed as
1/v +1 / u =1/ f  
Where u, v and f represents object distance, image distance and focal length respectively.
4.2 Linear magnification : Linear magnification is defined as the ratio of the size of image to the size of the object
i.e. m = I/O
(i) If one dimensional object is placed perpendicular to the principal axis, linear magnificaion is called transverse or lateral magnification and for mirrors becomes m = I/O= −v/ u 
m = negative, for real object-real image pair, for virtual object-virtual image pair m = positive, for real-virtual pair
(ii) However, if one dimensional object is placed along the principal axis, the so called longitudinal magnification and becomes 

Please click on below link to download pdf file for CBSE Class 12 Physics Reflection from Curved Surface Theory and Examples.