A thin prism P_1 with angle 4^@ and made for glass of refractive index 1.54 is combined with another thin prism P_2 made from glass refractive index 1.72 to produce dispersion without deviation. The angle of prism P_2 is

A thin prism P_1 with angle 4^@ and made for glass of refractive index

1.	A thin prism P_1 with angle 4^@ and made for glass of refractive index 1.54 is combined with another thin prism P_2 made from glass refractive index 1.72 to produce dispersion without deviation. The angle of prism P_2 is
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A thin prism P_1 with angle 4^@ and made for glass of refractive index 1.54 is combined with another thin prism P_2 made from glass refractive index 1.72 to produce dispersion without deviation. The angle of prism P_2 is

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