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A crown glass prism of angle 5 $^{\circ}$ is to be combined with a flint glass prism in such a way that the dispersion is zero. The refractive indices for violet and red lights are 1.523 and 1.514 respectively for crown glass and for flint glass are 1.632 and 1.614, then the angle of the flint glass prism is :
$10^{o}$
${2.5}^{o}$
$2^{o}$
${5.45}^{o}$

A

10^{o}

B

2^{o}

C

{2.5}^{o}

D

{5.45}^{o}

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