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NEET 2019, Physics Q20: Thin Lens and Mirrors

NEET2019Paper 2019Physics
Q.

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 ( = 1.5) as that of glass) then the equivalent focal length is F2 . The ratio F1 : F2 will be :

  1. A

    2 : 1

  2. B

    1 : 2

  3. C

    2 : 3

  4. D

    3 : 4

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