(a) Show using a proper diagram how unpolarised light can be linearly polarised by reflection from a transparent glass surface.
(b) The figure shows a ray of light falling normally on. the face AB of an equilateral glass prism having refractive index 3/2, placed A in water of refractive index 4/3. Will this ray suffer total internal reflection on striking the face AC? Justify your answer.

Explanation

The angle of incidence of the ray . On striking the face AC is `i= 60^(@) ` ( as from figure )
Also , relative refreactive index of glass . With respect ot the surrounding water is
` mur=(3//2)/( 4//3) =(9)/(8) `
Also ` sin i= sin 60^(@) =(sqrt(3))/( 2) =( 1.732)/( 2) `
`= 0.866`
For total internal reflection ,the requuired critical angle , in this case , is given by
` sin i_e = (1)/( mu ) = ( 8)/(9) = 0.89`
` therefore i lt i_3`
Hence the ray would not suffer total internal reflection on striking the face AC
[The students-may just write the two conditions needed for total internal reflection without analysis of the given case , student may be awarded