Question 53

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is $$F_1$$. When the space between the two lenses is filled with glycerin (which has the same refractive index $$(\mu = 1.5)$$ as that of glass) then the equivalent focal length is $$F_2$$. The ratio $$F_1 : F_2$$ will be:


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