of focal length f each

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Two similar thin equi-convex lenses, of focal length f each, are kept co-axially in contact with each other such that the focal length of the combination is F1​. When the space between the two lenses is filled with glycerin (which has the same refractive index (μ=1.5) as that of glass) then the equivalent focal length is F2​. The ratio F1​:F2​ will be
20
Aug
Two similar thin equi-convex lenses, of focal length f each, are kept co-axially in contact with each other such that the focal length of the combination is F1​. When the space between the two lenses is filled with glycerin (which has the same refractive index (μ=1.5) as that of glass) then the equivalent focal length [...]
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Tags: In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact , of focal length f each , Two similar thin equi-convex lenses , what will be angle of refraction? ,