A cancave lens is placed in contact with a convex lens of focal length 25 cm. The combinations produces a real image at a distance of 80cm, if an object is at a distance of 40 cm, the focal length of concave lens is:
Text Solution
Verified by ExpertsThe correct answer is:
A
: For the combination of focal length,
Here, u = - 40 cm, v = = 80 cm
Now, 
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