00:01
Hello students, according to the given quotient, a dentist uses a spherical mirror whose magnification value is given positive 4 .5 and the distance between the dentist spherical mirror and the patient tooth is given as u that is object distance is 1 .8 cm.
00:39
We have to find which mirror is used here and what is the focal length of this mirror.
00:58
Now here the magnification is given as positive 4 .5 and the image is upright and magnified.
01:24
Hence the mirror is convex because we know concave mirror always give a inverted image.
01:54
Now we have to find the focal length.
02:03
First we know the magnification is defined as the image distance upon the object distance with negative sign and this is also height of the image upon the height of object.
02:23
This is our magnification formula.
02:28
We know the value of m, magnification 4 .5, b, v because v is given we have to find and u that is given 1 .8 cm with negative sign.
02:50
Now we know the sign convention rule if it is either a concave mirror or a convex mirror the object always in the negative x direction...