1. Linear Polarisers: . How would you align the axes of two linear polarisers so

Question

1. Linear Polarisers: . How would you align the axes of two linear polarisers so that no light comes through? Consider the following diagram, where the polarisers 1 & 2 are aligned as described in the previous question. 1 2 3 Explain what happens if you put a third linear polariser in between i... it has the same alignment as the first one? It has the same alignment as the second one? it is somewhere in between? Draw diagrams showing the polarisation of the light in each region, and the axes of the polarisers

Explanation / Answer

1. given

a. axes of two linear polarisers should be perpendicular to each other so that no light passes thourhg the second polariser

b. if the third polariser has the same alignment as the first one, there is no change in output from the second polariser

if the third polariser has the same alignment as the second polariser, then the net output formthe second polariser again remains unchanged

if this orientation of the third polariser is somewaht in between the two polarisers , then the amount of light passing form the sedcond polariser increases as third polariser introduces step change in polarisation of the light form the first polariser so that more light can pass through the second plariser

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