A beam of light consisting of red, green and blue colours is incident on a right-angled prism on face AB. The refractive indices of the material for the above red, green and blue colours are 1.39, 1.44 and 1.47 respectively. A person looking on surface A C of the prism will see [JEE ONLINE 26-05-2012] |
A) no light
B) green and blue colours
C) red and green colours
D) red colour only
Correct Answer: D
Solution :
[d] For light to come out through face 'AC', total internal reflection must not take place. |
i.e., |
or |
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