17) A point source is kept in front of a convex mirror at a certain distance of 30
cm. The focal length of the mirror is 15 cm. Then the position of the image is
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Object distance u=−40 cm
Focal length f=40 cm
Using mirror formula :
v
1
+
u
1
=
f
1
Or
v
1
+
(−40)
1
=
(40)
1
We get v=20 cm
Focal length f=40 cm
Using mirror formula :
v
1
+
u
1
=
f
1
Or
v
1
+
(−40)
1
=
(40)
1
We get v=20 cm
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