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2. A thin prism P₁ with angle 4° and made from glass of
refractive index 1.54 is combined with another thin prism P₂
made from glass of refractive index 1.72 to produce
dispersion without deviation. The angle of the prism P₂ is
(a) 5.33°
(c) 3°
(b) 4°
(d) 2.6°

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