Question on: WAEC Physics - 1990
The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?
A
sin50o/sin40o
B
sin40osin50o
C
sin90o/sin50o
D
sin40o/sin90o
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Correct Option: E
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