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It is required to form an achromatic com...

It is required to form an achromatic combination of two prisms of dispersive powers 0.04 and 0.06 respectively . If the first prism has a refracting angle of `10^(@)` and mean refractive index of `1.52` , what must be the refracting angle of the second prism , if its mean refractive index is `1.56` ?

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