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  • Between the primary and secondary rainbows, there is a dark band known as Alexandra’s dark band. This is because A. light scattered into this region interfere destructively. B. there is no light scattered into this region.

Between the primary and secondary rainbows, there is a dark band known as Alexandra’s dark band. This is because

A. light scattered into this region interfere destructively.
B. there is no light scattered into this region.
C. light is absorbed in this region.
D. angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately 42° and 50°.

Answers (1)

Formed because of light scattered into the region interfere destructively the dark Alexander's band lie between the primary and secondary rainbow; thus, (a, d) are the correct options. The angle of the primary rainbow in the observer's eyes is from 41° to 42°, and in the secondary rainbow, the angle in the observer's eyes lies between 51° to 54° with respect to the incident light ray.

Therefore, the overall angle of scattered rays with reference to incident light of the sun ranges from 42° and 50°.

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infoexpert23

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