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If the refractive angles of two prisms m...

If the refractive angles of two prisms made of crown glass are `10^(@)` and `20^(@)` respectively, then the ratio of their colour deviation powers will be

A

`1 : 1`

B

`2 : 1`

C

`4 : 1`

D

`1 : 2`

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The correct Answer is:
d
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