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Physics
Ray Optics
a
b
c
d
Refractive index of A w.r.t B = $\mu_{A,B} = \frac{V_B}{V_A} = \frac{5}{4}$
Critical angle = $Sin^{-1}\frac{1}{\mu_{A,B}}$ = $Sin^{-1}\frac{4}{5}$