what is a magnification of mirror? please show with a proper sign convention. when the image is real and inverted and when the image is virtual and errect.
Answers
If the magnification is greater than one, the image is larger than the object, but if the magnification is smaller than one the image is smaller than the object. For example, if the magnification is one half, then the image appears to be half the size of the object. ... If the sign is positive, then the image is upright.
Magnification of mirror is the ratio of the height of object(ho) to the height of image(hi).
m=hi/ho
or Magnification produced by a mirror is equal to the ratio of the distance of object(v) to the distance of image(u) from the mirror with a minus sign.
m=-v/u
and also
m=hi/ho=-v/u
sign convention
ho=+ve (always)
u=-ve (always)
in cocave mirror
principal focus=-ve
in convex mirror
principal focus=+ve
when the image is real and inverted
hi=-ve
v=-ve
when the image is virtual and erect
hi=+ve
v=+ve