What A Prism!

An Isosceles Glass Prism With Base Angles 40 Degrees Is Clamped Over A Tray Of Water In A Position Such That

The Base Is Just Dipped In Water. A Ray Of Light Incident Normally On One Of The Inclined Face Suffers Total

Internal Reflection At The Base. Find The Minimum Value Of The Refractive Index Of The Glass Which The Prism Is

Made Up Of .

Details And Assumptions

Refractive Index Of Water = 4/3

sin (40) = 0.64 (degrees)

Give The Answer To 2 Decimal Places

Source- KVPY 2015 (SA Stream)


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