image 1 cm long of object is formed on a screen by convex lens keeping the object and the screen is the lens is moved until a s image is formed on the screen if the image of 0.75 cm long what is the length of the object
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Answer:
Explanation:Correct option is
D
The focal length of the lens is 21.6 cm.
h
object
2
=h
image1
×h
image2
h
object
=
36
=6
magnification of image is
u
v
=
6
9
v=
2
3u
in lens displacement method , u+v=d ; uv=df
u+
2
3u
=90
u=36 => v=54
uv=df
f=
90
36×54
=21.6
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