A crown glass prism ofg refrecting 6^(@)...

A crown glass prism ofg refrecting `6^(@)` is to be achromatised for red and blue light using a flint glass prism. The angle of sercond and net deviation is

`9^@, 1.134^@`

`6^@, 2.268^@`

`3^@, 3.334^@`

`3^@, 1.134^@`

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