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0. A ray of light in air is incident on an equilateral glass prism at an angle θi to the normal. After refraction, the light travelled parallel to the base of prism and emerged in air at an angle θc to the normal. If the angle between the incident and the emergent rays is 600, then the refractive index of glass with respect to air is (NTSE Stage-II,2015-16)
1.33
1.5
1.73
1.66
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