Consider an equilateral prism (refractive index $ \sqrt{2} $). $A$ ray of light is incident on its one surface at a certain angle $ i $. If the emergent ray is found to graze along the other surface, then the angle of refraction at the incident surface is close to . . . . . . . (in $^{\circ}$)
- A$15$
- B$20$
- C$40$
- D$30$
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