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Shown in the figure is a convergent le...

Shown in the figure
is a convergent lens placed inside a cell filled with a liquid. The lens has a focal length 20 cm when in air and its material has a refractive index 1.5. If the liquid has refractive index 1.6, the focal length of system is

A

80 cm

B

`-80 cm`

C

`-24 cm`

D

`-100 cm`.

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