An object hight 2cms is placed
at 20cm distant in front of a concave mirror whose focal length is 15cm.calculate height of the case
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Size of object h
o
=2cm
Size of the object h
i
=?
Focal length f=−12cm
Object distance u=−20cm
Image distance v=?
Using mirror formula
f
1
=
v
1
+
u
1
−12
1
=
v
1
+
−20
1
v
1
=
60
−5+3
v=−30cm
Magnification (M)=
h
o
h
i
=
u
−v
=
−20
30
=−1.5
h
i
=−1.5×2=−3cm
Image will be real, inverted and magnified
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