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Question
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 Figure . In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?
 |
 |
 |
 |
| (i) | (ii) | (iii) | (iv) |
Options
(i)
(ii)
(iii)
(iv)
Solution
(ii)
Explanation -
If Prism is kept with base BC at the bottom, then the emerged band of colour would show violet at the bottom.
If Prism is kept with base BC at the top, then violet would be at the top, followed by indigo and blue.
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