The rainbow is an example of the dispersion of sunlight by the water drops in the atmosphere. This is a phenomenon due to combined effect of dispersion refraction and reflection of sunlight by spherical water droplets of rain. The conditions for observing a rainbow are that the sun should be shining in one part of the sky (say near western horizon) while it is raining in the opposite part of the sky (say eastern horizon). An observer can, therefore, see a rainbow only when his back is towards the sun.

Question

CASE_STUDIESDispersion of White Light by PrismAtmospheric Refraction and Its EffectsCBSE PYQ3 sub-questions