Two prisms A and B have dispersive powers of 0.012 and 0.018 respectively. The two prisms are incontact with each other. The prism 'A' produces a mean deviation of 1.2^@, the mean deviation produced by 'B' if the combination is achromatic is

Two prisms A and B have dispersive powers of 0.012 and 0.018 respectiv

1.	Two prisms A and B have dispersive powers of 0.012 and 0.018 respectively. The two prisms are incontact with each other. The prism 'A' produces a mean deviation of 1.2^@, the mean deviation produced by 'B' if the combination is achromatic is
Answer» `3.6^@ ` `0.8^@` `0.4^@` `1.8^@` ANSWER :B

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Two prisms A and B have dispersive powers of 0.012 and 0.018 respectively. The two prisms are incontact with each other. The prism 'A' produces a mean deviation of 1.2^@, the mean deviation produced by 'B' if the combination is achromatic is

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