A Layer of Ethyl Alcohol (N = 1 $\degree$ B)88 $\degree$ C)68 $\degree$

question 21

Multiple Choice

A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333) .To the nearest degree,at what angle relative to the normal to the interface of the two liquids is light totally reflected?

• A)78\(\degree\)
• B)88\(\degree\)
• C)68\(\degree\)
• D)49\(\degree\)
• E)the critical angle is undefined

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