a magnifying lens has a focal length of hundred mm and object to size it is placed at some distance from the lens that the image is formed at a distance of 25cm in front of lens find;
a)distance between object and lens
b) where should be the object placed if the image is to form at infinity
a)distance between object and lens
b) where should be the object placed if the image is to form at infinity
Answers & Comments
Answer:
(b) The object should be placed at the focus F′ (here 100mm) so that the image is formed at infinity.
Explanation:
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Explanation:
f=100mm
h
1
=16mm
v=−25cm=−250mm
(a)
v
1
−
u
1
=
f
1
−250
1
−
u
1
=
100
1
u
1
=−
500
7
u=−71.4mm=−7.14cm.
Distance between object and lens is 7.14cm.
(b) The object should be placed at the focus so that the image is formed at infinity.
So, u=−100mm=−10cm
The object should be placed 10cm in front of the lens.