Deviation in refraction and TIR

[Jon Drake]

Homework Statement

Light is incident from glass (n=1.5) to water (n=1.33). Find out the range of angle of deviation for which there are two angles of incidence.

Homework Equations

Snell's Law

The Attempt at a Solution

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The lowest value of angle of deviation would be 0° when i = 0. But, I am unable to find the highest value. Would it be during refraction or TIR?

 

[Jon Drake]

Someone please help.

 

[PeterO]

Someone please help.

Calculate a couple of angles of deviation - perhaps with angle of incidence 20 and 40 degrees (assuming they are both below the TIR situation) - and then you may see which way to proceed.