Situation 18.1 A Tank Holds a 1.44 M Thick Layer of Oil

question 7

Multiple Choice

Situation 18.1
A tank holds a 1.44 m thick layer of oil that floats on a 0.96 m thick layer of brine.Both liquids are clear and do not intermix.Point O is at the bottom of the tank,on a vertical axis.The indices of refraction of the oil and the brine are 1.40 and 1.52,respectively.
-In Situation 18.1,a ray originating at O reaches a point on the oil-air interface at the critical angle.The distance of this point from the axis is closest to:

• A)1.5 m
• B)1.7 m
• C)1.9 m
• D)2.1 m
• E)2.3 m

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