The position of object is 25 cm from a concave mirror. If the linear magnification is +3 then the position of image is
A.
-35 cm
B.
+35 cm
C.
-75 cm
D.
+75 cm
Answers
Answered by
2
=−25cm,u
2
=−(25+15)=−40cm
m
1
=−
u
1
v
1
m
2
=−
u
2
v
2
m
2
m
1
=
v
2
v
1
×
u
1
u
2
4=
v
2
v
1
.
25
40
v
1
=2.5v
2
u
1
1
+
v
1
1
=
f
1
⇒
−25
1
+
2.5v
2
1
=
f
1
....(1)
u
2
1
+
v
2
1
=
f
1
⇒
−40
1
+
v
2
1
=
f
1
....(2)
Divinding (2) by 2.5 ,
−100
1
+
2.5v
2
1
=
f
1
......(3)
(1)−(3)⇒
−25
1
+
100
1
=
f
1
−
2.5f
1
100
−3
=
2.5f
1.5
f=−20cm
l think this is helpful for you
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