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 (µ = 1.5) as that of glass) then the equivalent focal length is F 2 . The ratio F 1 : F 2 will be :

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 (µ = 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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Medical NEET Old Physics

A 2 : 3

B 3 : 4

C 2 : 1

D 1 : 2