When the rectangular metal tank is filled to the top with an unknown liquid, as observer with eyes level with the top of the tank can just see the corner E ; a ray that refracts towards the observer at the top surface of the liquid is shown. The refractive index of the liquid will be
A
1.2 
B
1.4
C
1.6
D
1.9
Text Solution
Verified by ExpertsThe correct answer is:
A
Light ray is going from liquid (Denser) to air (Rarer) and angle of refraction is 
, so angle of incidence must be equal to critical angle
from figure
Also 
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