The angle of minimum deviation produced by a `60^(@)` prism is `40^(@)`. Calculate the refractive index of the material of the prism.

Explanation

To find the refractive index of the material of a prism given the angle of the prism and the angle of minimum deviation, we can use the formula:

\[ \mu = \frac{\sin\left(\frac{A + D_m}{2}\right)}{\sin\left(\frac{A}{2}\right)} \]

Where:
- \( \mu \) is the refractive index,
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