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WAEC - Physics (1990 - No. 32)
The diagram above shows an incident ray A, inclined at angle of 50
o
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?
sin50
o
/sin40
o
sin40
o
sin50
o
sin90
o
/sin50
o
sin40
o
/sin90
o
sin90
o
/sin40
o
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