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The critical angle $$\theta c$$ in an optical fiber is given by .............. Where $$n_1$$, is refractive index of medium 1 and $$n_2$$ is the refractive index of medium 2.
$$\sin^{-1}(\frac{n_{2}}{n_{1}})$$
$$\sin^{-1}(\frac{n_{1}}{n_{2}})$$
$$\sin^{-1}({n_{2}} * {n_{1}})$$
$$\sin^{-1} n_{2}$$
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