Question

The index of refraction for calcite is 1.6557 for red light and 1.6803 for violet light. Light containing both of these colors is traveling in air and strikes a flat side of the crystal below.

a) If the angle of incidence is 85° with the vertical, what is the width of the rainbow?

b) What would happen if the crystal was turned on its side, making it taller? What would the width of the rainbow be?

10 cm 20 cm

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