Sign Convention for Spherical Mirror:
1:-All the distance are measured from pole of the mirror as origin.
2:-Distance measured in the same direction as that of incident light are taken as positive.
3:-Distance measured against the direction of incident light are taken as negative.
4:-Distance measured upward and perpendicular to the principal axis are taken as positive.
5:-Distance measured downward and perpendicular to the principal axis are taken as negative
Mirror Formula:-
so
Where
v=distance of image from mirror
u=distance of object from mirror
f=focal length of the mirror
Linear Magnification(m):-
The ratio of the height of image to the height of object is known as linear magnification.Note:
1:- ho always will be positive
2:- If hi is virtual than it will be positive and hi is real than it will be negative
3:-If the magnification has a minus sign, therefore image is real and inverted.
4:-If the magnification has a positive sign, therefore image is virtual and erect.
2:- If hi is virtual than it will be positive and hi is real than it will be negative
3:-If the magnification has a minus sign, therefore image is real and inverted.
4:-If the magnification has a positive sign, therefore image is virtual and erect.