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Solution


Q.

Which set of colours will come out in air for a situation shown in figure                 [2023]
1 Yellow, Orange and Red  
2 All  
3 Orange, Red and Violet  
4 Blue, Green and Yellow  

Ans.

(1)

The critical angle in the case of total internal reflection is directly proportional to wavelength of light.

ic∝λ

Yellow, orange, red emerge from air.

λ is inversely proportional to refractive index of the medium.

Hence, critical angle will be greater for constituents of light having larger wavelength (than green).