Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length `+ 20 cm` when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is A. `+80 cm`B. `-80 cm`C. `-24 cm`D. `-100 cm`

Shown in the figure here is a convergent lens placed inside a cell fil

1.	Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length `+ 20 cm` when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is A. `+80 cm`B. `-80 cm`C. `-24 cm`D. `-100 cm`
Answer» Correct Answer - D

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