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A converging thin lens has a focal length of
50 cm in air. When immersed in a liquid, its
focal length is measured to be 250 cm. If the
index of refraction of the lens is 1.5, then
determine the index of the liquid.
O 1.43
O 1.385
O 1.46
O 1.36
O 1.33
O 1.485

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