Q.4. An equilateral prism deviates a ray of light through 23$\xb0$ for two angles of incidence, which differs by 23$\xb0$. The refractive index of prism is

a) $\frac{\sqrt{33}}{5}$

b) $\frac{\sqrt{43}}{5}$

c) 1.5

d) $\frac{4}{3}$

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