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     EduGorilla 
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    Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvatures 25 cm and 20 cm, respectively. If they are placed in contact with their curved surfaces towards each other and the space between them is filled with liquid of refractive index , then the combination of lenses is 

    Options :-

    1. convex of focal length 70 cm
    2. concave of focal length 70 cm
    3. concave of focal length 66.6 cm
    4. convex of focal length 66.6 cm
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