Lens Maker's Formula and Combination of Lenses

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1. 1 2019 Reproduction in Organisms #
   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:
   A $2:1$

   B $1:2$

   C $2:3$

   D $3:4$
   Check Answer

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