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

Options

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^(@)`

Answer

1,4

Explanation

(a,d) The Alexandar’s dark band lies between the primary and secondary rainbows, formed due to light scattered into this region interfere destructively. The primary rainbows subtends an angle nearly `41^(@)`t0 `42^(@)`at observer’s eye, whereas secondary rainbows subtends an angle nearly `51^(@)` to `54^(@)` at observer’s eye w.r.t. incident light ray. Hence, the scattered rays with respect to the incident light of the sun lies between approximately `42^(@)` and `50^(@)`