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 below Figure. In which of the following diagrams, after dispersion, the third colour from the top of the spectrum corresponds to the colour of the sky?
A. (i)
B. (ii)
C. (iii)
D. (iv)
Answer -
- When white light passes from prism, it is dispersed as VIBGYOR
- And, color of the sky is blue
In this question , we want the case where Blue is the 3rd color from top.
- In a normal prism, 3rd color from top is Yellow
- But, in an i nverted prism , 3rd color from top is Blue. Thus, image (ii) is correct
So, the correct answer is (b)