1.

When light passes through two polaroids P_(1) and P_(2), then transmitted polarisation is the component parallel to the polaroid axis. Which of the following is correct?

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Solution :If the light from an ordinary SOURCE (like a sodium lamp) PASSES through a polaroid sheet `P_(1)`. It is observed that its intensity is reduced by half. Rotating `P_(1)` has no effect on the transmitted BEAM and transmitted intensity remains constant. Now, let an identical piece of polaroid `P_(2)` be placed before `P_(1)`. As expected the light from the lamp is reduced in intensity on passing through `P_(2)` ALONE. But now rotating `P_(1)` has a dramatic effect on the light coming from `P_(2)`. In one position, the intensity transmitted by `P_(2)` followed by `P_(1)` is nearly zero. When turned by `90^(@)` from this position, `P_(1)` transmits nearly the full intensity emerging from `P_(2)` as shown in figure.


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