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  • 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 11.1.

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 11.1. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

(a) (i)

(b) (ii)

(c) (iii)

(d) (iv)

Answers (1)

Ans.

Given that third colour from the top corresponds to the colour of the sky, i.e., blue.
In normal orientation, the third colour from top is yellow (as shown in the figure).
The third colour from bottom is blue.

So we have to rotate the prism upside down so that blue comes at the third position from top. We can do this as follows:

Therefore option (ii) is correct

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infoexpert26

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