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Two convex lenses with focal length f are kept apart from each other at a distance of 3f. What will be the object distance so that the image formed by the lenses are real?

Two convex lenses with focal length f are kept apart from each other at a distance of 3f. What will be the object distance so that the image formed by the lenses are real? 

Grade:12

1 Answers

Vikas TU
14149 Points
6 years ago
 
Central Length = f cm 
 
Picture Distance = v cm 
 
From the Lens recipe, 
 
1/v-1/u = 1/f 
 
1/u = (f-v)/fv 
 
u = fv/(f-v) 
 
As v = 3f 
 
u = 3f2/(- 2f) 
 
u = - 3f/2 

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