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Q.

Two plano-concave lenses of glass of refractive index 1.5 have radii of curvatures 20 cm, 30 cm. They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index 43 . The focal length of the system is

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a

48 cm

b

72 cm

c

12 cm

d

24 cm

answer is B.

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Two plano-concave lenses of glass of refractive index 1.5 have radii of curvatures 20 cm, 30 cm. They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index 43 . The focal length of the system is