Light going from glass (index of refraction = 1.4) to ethanol has a critical angle of incidence of 65°. what is the index of refraction of ethanol?

1.27

Explanation:

= Index of refraction of glass = 1.4

= Index of refraction of ethanol = ?

i = Angle of incidence = critical angle = 65° deg

r = Angle of refraction = 90° deg

Using Snell's law

Sini = Sinr

(1.4) Sin65 = Sin90

= 1.27

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