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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 F1. When the space between the two lenses is filled with glycerine (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 :
  • a)
    2 : 1
  • b)
    1 : 2
  • c)
    2 : 3
  • d)
    3 : 4
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Two similar thin equi-convex lenses, of focal length f each, are kept ...


Equivalent focal length in air 
When glycerin is filled inside, glycerin lens behaves like a diverging lens of focal length (–f)
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Community Answer
Two similar thin equi-convex lenses, of focal length f each, are kept ...


Equivalent focal length in air 
When glycerin is filled inside, glycerin lens behaves like a diverging lens of focal length (–f)
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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 F1. When the space between the two lenses is filled with glycerine (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 :a)2 : 1b)1 : 2c)2 : 3d)3 : 4Correct answer is option 'B'. Can you explain this answer?
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