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 Figures given below. In which of the following cases, after dispersion, the sixth colour from the top corresponds to the colour of the sun?
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When the prism is placed with angle A in the upward direction, the third colour from the top is yellow. But we have been given that the third colour from the top is blue (colour of the sky).
Thus base BC must be on the top. That is, the prism must be inverted.
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