A thin prism P with angle `4^(@)` and made from glass of refractive index 1.54 is combined with another thin prism P made from glass of refractive index 1.72 to produce dispersion without deviation The angle of prism P is

A thin prism P_(1) with angle 4^(@) and made from a glass of refractive index 1.54 is comined with another thin prism P_(2) made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P_(2) is

A thin prism P_(1) with angle 4degree and made from glass of refractive index 1.54 is combined with another thin prism P_(2) made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P_(2) is

A thin prism P_(1) with angle 4degree and made from glass of refractive index 1.54 is combined with another thin prism P_(2) made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P_(2) is

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