Two similar thin equi-convex lenses, of focal f each, are kept coaxially 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 - VgyanHub

Question:

Two similar thin equi-convex lenses, of focal f each, are kept coaxially 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

Options :

(a) 3:4
(b) 2:1
(c) 1:2
(d) 2:3

Answer :

(c) 1:2

Answer Steps :

step 1

step 2

step 3

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