A bi-convex lens is formed with two thin planoconvex lenses as shown in the figure. Refractive index 
of the first lens is 1.5 and that of the second lens is 1.2 . Both the curved surfaces are of the same radius of curvature 
cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be
Text Solution
Verified by ExpertsThe correct answer is:
B
Using lens maker's formula
For first plano convex lens.
For second plano convex lens.
If f is combined focal length of bi-convex lens, then
For this lens, 
?
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