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If the apex angle of a prism is o = 70° (see figure below), what is the minimum incident angle for a ray if it is to emerge f
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at 90.8 +90 - 12 = 180 now for emergence le sic a las sint in iz €45.580 or ry 70-45.58 yr 24.4159 now Siniz 1.4sin 24. 45° )

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