A prism ABC (with BC as base) is placed in di | vedclass

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(C) When white light passes through a prism,it disperses into its constituent colours: Violet,Indigo,Blue,Green,Yellow,Orange,and Red $(VIBGYOR)$.The

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$(ii)$

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(C) When white light passes through a prism,it disperses into its constituent colours: Violet,Indigo,Blue,Green,Yellow,Orange,and Red $(VIBGYOR)$.The light bends towards the base of the prism.In case $(i)$,the base is $BC$. The light enters through face $AB$ and bends towards the base $BC$. The order of colours from top to bottom will be $Red, Orange, Yellow, Green, Blue, Indigo, Violet$.The third colour from the top is Yellow.In case $(ii)$,the prism is inverted,so the base is $BC$ at the top. The light bends towards the base (upwards). The order of colours from top to bottom will be $Violet, Indigo, Blue, Green, Yellow, Orange, Red$.The third colour from the top is Blue,which corresponds to the colour of the sky.Therefore,case $(ii)$ is the correct orientation.

$A$ prism $ABC$ (with $BC$ as base) is placed in different orientations. $A$ narrow beam of white light is incident on the prism as shown in the figure. In which of the following cases,after dispersion,the third colour from the top corresponds to the colour of the sky?

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