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For any prism, prove that: where the terms have their usual meaning.
For any prism, prove that: $'n'\text{ or }\mu = \frac{\sin\left(\frac{A + \delta_m}{2}\right)}{\sin\left(\frac{A}{2}\right)}$ where the terms have their usual meaning.
To show: $\mu = \frac{\sin\left(\frac{A + \delta_m}{2}\right)}{\sin\left(\frac{A}{2}\right)}$
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From ISC 2018 Physics Paper 1, question 16(a).