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A screen is placed D cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by d cm. Derive the formula for the focal length of the lens.
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7 years ago

Ramesh V
70 Points
```										Distance between object and image, = D cm
Distance through which lens is displaced, = d cm
Now, D = u + v ; d = u - v
or    D = u + v ; d = v - u
where u = object distance and v= image distance
1/f = 1/u + 1/v
as (v+u)2 = (v-u)2 +4vu i.e., D2 -d2 = 4vu
f = vu/(v + u)
focla length  =(D2 - d2)/4D
--
regards
Ramesh
```
7 years ago
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