A thin prism P_(1) with angle 4^(@) and made for glas 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 glas of refractive in

1.	A thin prism P_(1) with angle 4^(@) and made for glas 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 glas 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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