it is found that then reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

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Unpolarised light is incident from air on a plane surface of a material of refractive index ′μ′. At a particular angle of incidence ′I′ , it is found that then reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
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Unpolarised light is incident from air on a plane surface of a material of refractive index ′μ′. At a particular angle of incidence ′I′ , it is found that then reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation? it is found that then reflected [...]
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