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

Options

A. `12^(@)2.4'`
B. `12^(@)4'`
C. `1.24^(@)`
D. `12^(@)`

Answer

A

Explanation

For dispersion without deviation `(A)/(A^('))=((mu'_(y)-1))/((mu_(y)-1))` `:. (A)/(10)=((1.602-1))/((1.500-1))=(0.602)/(0.500)impliesA=12^(@)2.4^(')`