Flint glass prism is joined by a crown g...

Flint glass prism is joined by a crown glass prism to produce dispersion without deviation. The refractive indices of these for mean rays are `1.602` and `1.500` respectively. Angle of prism of flint prism is `10^(@)`, then the angle of prism for crown prism will be

`12^(@) 2.4`

`12^(@) 4'`

`1.24^(@)`

`12^(@)`

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