Rainbow is seen only for a definite angle range with respect to the ground. Justify.

Monjur Alahi

Rainbow is seen only for a definite angle range with respect to the ground. Justify.


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Salim Ahmed Kawsar

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i. For clear visibility of rainbow, a beam must have enough intensity.

ii. The curve for angle of deviation and angle of incidence is almost parallel to X-axis near minimum deviation i.e., for majority of angles of incidence in this range, the angle of deviation is nearly the same and those rays form a beam of enough intensity.

iii. Rays beyond this range suffer wide angular dispersion and thus will not have enough intensity for visibility. Hence, the rainbow is seen only for a definite angle range with respect to the ground for which the intensity of the beam is enough for the visibility.

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