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Calculate the maximum value of the angle of incidence that a ray can make with the axis of a fiber such that it is guided through the fiber for the following fiber parameters...
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Calculate the maximum value of the angle of incidence that a ray can make with the axis of a fiber such that it is guided through the fiber for the following fiber parameters. $$ \text { (i) } n_1=1.6, n_2=1.5 \text {, (ii) } n_1=2.1, n_2=1.5 $$
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