(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 in water of refractive index 4/3 Will this ray suffer total internal reflection on striking the face AC ?
Justify your answer.

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Detailed Solution

(a) Polarisation of light by reflection from a transparent class surface:
Question Image
(b) Given, $a_{g} = \frac{3}{2} and {aμ}_{g} = \frac{4}{3}$
$^{w} μ_{g} = \frac{^{a} μ_{g}}{^{a} μ_{w}} = \frac{3 / 2}{4 / 3} = \frac{9}{8} = 1 .125$
We know at critical angle C,
$\begin{aligned} ^{w} μ_{g} = \frac{1}{\sin C} \\ or \sin C = \frac{1}{^{w} μ_{g}} = \frac{1}{1 .125} = 0 .88 \\ ie ., C = 62 {.73}^{\circ} \end{aligned}$
But from the figure, light will incident on face AC making an angle 60° with the normal i.e., i=60°