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We know that:
\mu_{w}=refractive\ index\ of\ water\\\\\mu_{b}=refractive\ index\ of\ benzene\\\\\mu_{bw}=refractive\ index\ of\ benzene\ wrt\ water\\=\frac{\mu_b}{\mu_w}=\frac{1.50}{1.33}=1.128

Thus th refractive index becomes less wrt to another medium other than air.
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