Refractive index of diamond with respect

Question:

Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5.

Find out the absolute refractive index of diamond.

Solution:

$n_{d g}=1.6$ and $n_{g u}=1.5$

$n_{\alpha}^{\circ}=?$

Now $n_{d g}=\frac{n_{d a}}{n_{g a}}$

$\therefore n_{d u}=n_{d_{d}} \times n_{s e}=1.6 \times 1.5=2.4$

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