A lens behaves as diverging lens in air (μ = 1) and converging lens in water (μ = 1.3). The refractive index (μ) of the material of the lens is

1
1.0 < μ < 1.3
2
μ > 1.3
3
μ < 1.0
4
\(\mu = \frac{{1.0 + 1.3}}{2}\)

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