Answer :
The magnification of the image is 0.4cm.
What is magnification?
Magnification is the processes of enlarging to the apparently sizes, not physical sizes, of something's. This enlargements is quantifies by a calculates numbers also called "magnifications".
Height of the object= 10cm
Focal length of the lens is f=20 cm
Here we are using the formula
1/v-1/u = 1/f
Where v be the position of the image and u be the position of the object.
Here we take all the distances with negative sign.
Which is the front of delivering lens and with posetive sign which is behind the lens that is:
u=-30cm
f=-20cm
then,
1/v-1/-30=1/-20
1/v= -1/30-1/20
v=-12cm
negative sign shown that image is in front side of the lens
magnification of the image is
m=v/u
m=-12/-30
m=0.4 cm.
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