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#### Question

If the critical angle of a medium is sin^{-1}[3/5], find the polarising angle.

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Two polaroids P_{1} and P_{2} are placed with their pass axes perpendicular to each other. An unpolarised light of intensity *I*_{o} is incident on P_{1}. A third polaroid P_{3} is kept in between P_{1} and P_{2} such that its pass axis makes an angle of 45° with that of P_{1}. Determine the intensity of light transmitted through P_{1}, P_{2} and P_{3}

If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................

(a) `1/sqrt3`

(b) `sqrt(3/2)`

(c) 1

(d) `sqrt3`

Using the phenomenon of polarisation, show how the transverse nature of light can be demonstrated.

What is a polaroid? State its 'two' uses.

What dose a polaroid consist of?