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
Text Solution
Verified by ExpertsThe correct answer is:
D
Let F be the focal length of the system. then,
……… . (i)
………… (ii)
…… .. (iii)
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