8. Among the adult population of a certain town 50% of the population are male, 60% are wage earners and 50% are 45 years of age or over. 10% of the males are not wage earners and 40% of the male are under 45 years. Can we infer anything about what percantage of the population of 45 or over are wage-earners? (Hint: Taking the attributes, ‘male', 'wage earners', "45 years or over " as A, B, C respectively find the limits of (BC)).
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Answer:
Correct option is
D
emerge into the air with an angle of refraction equal to 90o
Using Snell's law:
μisin(i)=μrsin(r)
⇒2sin(45)=sin(r)∴r=90
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