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The refractive index of the crown glass ...

The refractive index of the crown glass for violet and red lights are 1.51 and 1.49 respectively and those of flint glass are 1.77 and 1.73 respectively. A narrow beam of white light is incident at a small angle of incident on shown combination of thin prism. Find values of `alpha` for which mean deviation of beam is zero. Also calculate net dispersing.

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`alpha = 4`, Dispersion = 0.04
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