At what distance should an object be placed from a convex length of focal length 18cm to obtain an image at 36cm from it
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Heya
We can use the lens formulae here
Image distance = 36cm
Focal length = 18cm
1/f = 1/v - 1/u
Using sign convention
1/18 = 1/36 - 1/u
1/18 - 1/36 = 1/u
(2-1)/36 = 1/u
1/36 = 1/u
u=36m
The object should be placed at 36cm
We can use the lens formulae here
Image distance = 36cm
Focal length = 18cm
1/f = 1/v - 1/u
Using sign convention
1/18 = 1/36 - 1/u
1/18 - 1/36 = 1/u
(2-1)/36 = 1/u
1/36 = 1/u
u=36m
The object should be placed at 36cm
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