The referacting angles of the flint and crown glass prisms are A′ and A and their refractive indices are μ′ and μ respectively. They are to be used for dispersion without deviation. The ratio of their referacting angles A′A will be :
A
A′A=(1+μμ′−1)
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B
A′A=(1−μμ′−1)
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C
A′A=(1−μμ′+1)
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D
A′A=(1−μ1−μ′)
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Solution
The correct option is BA′A=(1−μμ′−1) We know that, for dispersion without deviation :
Angle of deviation due to prism 1 + Angle of deviation due to prism2=0