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[" Two plane-concave lenses "(1" and "2)...

[" Two plane-concave lenses "(1" and "2)" of "],[" glass of refractive index "1.5" have radii of "],[" curvature "25cm" and "20cm" .They are placed "],[" in contact with their curved surface towards "],[" each other and the space between them "],[" is filled with liquid of refractive index "4/3" ."],[" Then the combination is "]

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Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 20 cm and 10 cm. They are placed in contact with their curved surface towards each other and the space between them is filled with liquid of refractive index 4/3. Then the combination is

Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 25 cm and 20 cm. They are placed in contact with their curved surface towards each other and the space betweent hem is filled with liquid of refractive index (4)/(3) the the combination is

Two plano concave lenses of glass of refractive index 1.5 have radii of curvature 20 cm and 30 cm respectively. They are placed in contact with the curved surface towards each other and the space between them is filled with a liquid of refractive index 5/2. The focal length of the combination is (in cm)

Two plano concave lenses of glass of refractive index 1.5 have radii of currature 20cm and 30cm respectively.They are placed in contact with the curved surface to wards each other and the space between them is filled with a liquid of refractive index (5)/(2) . The focal length of the combination is (in cm)

Two plano concave lenses of glass of refractive index 1.5 have radii of currature 20cm and 30cm respectively. They are placed in contact with the curved surface to wards each other and the space between them is filled with a liquid of refractive index 3. The focal length of the combination is (in cm) (A) 12 (B) 16 (C) -92