the critical angle for glass air interface is ic. will the critical angle for glass water interface be greater than or less than ic ? why?

Solution:

For glass-air interface,the formula for critical angle is given by

 sin ic = 1/aμg
The critical angle i’c for glass water interface is given by
Sin ic' = 1/ wμg
Now wμg < aμg
Sin i'c > Sin ic or i'c > ic

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 it is because the refractive index for glass air interface is greater than that of glass water interface. 

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since u=i/sin(ic)

aug>wug so sin(ic) of glass water is more than that of glass air.

Hence ic glass-water is more than glass-air

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