Dispersion — AngularMediumQuestion 20219
Question
Angular dispersion produced by a prism is the difference in deviation for:
- ARed and blue light: δ_v − δ_r = (n_v − n_r)ACorrect
- BRed and yellow light
- CAll colours combined
- DOnly the primary colours
Correct answer
Red and blue light: δ_v − δ_r = (n_v − n_r)A
Explanation
Angular dispersion = δ_v − δ_r = (n_v − n_r)A. Dispersive power ω = (n_v − n_r)/(n_y − 1) = angular dispersion / mean deviation.