Spectrometer i-i' curve

How does the refractive index changes with wave length ?
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If the velocity of incident ray is less than the velocity of transmitted ray through a medium. Then angle of refraction is _______
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When the angle of the prism changes from 500 to 700, then what happens to the minimum deviation ?
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Which among the following phenomena causes the light to change the rectilinear propagation while passing through different mediums?
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If the angle of prism decreases. what will happen to the angle of minimum deviation?
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