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
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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 [NSEP 1994; DPMT 2000] A) + 80 cm.
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