A plano-convex lens (focal length 
, refractive index 
, radius of curvature 
) fits exactly into a plano-concave lens (focal length 
refractive index 
radius of curvature 
). Their plane surfaces are parallel to each other. Then, the focal length of the combination will be:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
JEE Main 2019
Now when combined the focal length is given by
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