For flint and crown glass prisms,the prism an | vedclass

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(A) For dispersion without deviation,the net deviation produced by the combination of two prisms must be zero.Let $\mu_y$ and $\mu_y'$ be the refracti

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$\frac{(\mu_y - 1)}{(\mu_y' - 1)}$

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(A) For dispersion without deviation,the net deviation produced by the combination of two prisms must be zero.Let $\mu_y$ and $\mu_y'$ be the refractive indices of the crown and flint glass prisms for the mean color (yellow),respectively.The deviation produced by the crown glass prism is $\delta = (\mu_y - 1)A$.The deviation produced by the flint glass prism is $\delta' = (\mu_y' - 1)A'$.For dispersion without deviation,the total deviation must be zero,so $\delta + \delta' = 0$.Since the prisms are arranged to produce dispersion,they must be placed in opposite orientations,so $(\mu_y - 1)A + (\mu_y' - 1)A' = 0$.Taking the magnitude,we have $(\mu_y - 1)A = (\mu_y' - 1)A'$.Therefore,the ratio $A'/A = \frac{(\mu_y - 1)}{(\mu_y' - 1)}$.

For flint and crown glass prisms,the prism angles are $A'$ and $A$ respectively. When they are used to produce dispersion without deviation,the ratio $A'/A$ will be:

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