The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 4 m away by means of a large convex lens. What is the maximum possible focal length of the lens required for this purpose?
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Answered by
1
Given that,
Object distance = u
Image distance = v
Focal length = f
Now, the distance between the object ad the image
d = u+v
d = 4m
Now, the maximum focal length of the convex length
f =44
f =1m
Hence, the maximum possible focal length is 1 m .
Answered by
1
Answer:
Given: The distance between the object and the image is d=3m.
The maximum focal length of the lens is given by:
f
max
=
4
d
For real image f
max
=
4
3
=0.75m
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