Figure shows two spherical surface of radii R and 2R separating three transparent media of refractive index 
= 4, 
= 2 and 
= 1. A ray of light travelling in a medium 
= 1 is incident on outer sphere tangentially. The net deviation suffered by light ray will be
Text Solution
Verified by ExpertsThe correct answer is:
C
240°
Path of light ray for minimum deviation will be
sin 90° = 2sin 
= 30°
Deviation= 60°
There are 4 such deviations therefore total deviation=240 °.
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