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A prism of a certain angle deviates the ...

A prism of a certain angle deviates the red and blue rays by `8^@` and `12^@` respectively. Another prism of same angle deviates the red and blue rays by `10^@` and `14^@` respectively.The prisms are small angled and made of different materials. The dispersive powers of material of prisms are in the ratio

A

`6 : 5`

B

`11 : 9`

C

`5 : 6`

D

`9 : 11`.

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