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WAEC - Physics (1990 - No. 32)

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?
sin50o/sin40o
sin40osin50o
sin90o/sin50o
sin40o/sin90o
sin90o/sin40o

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