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1. Distinguished between polarised and unpolarised light. 2. ‘Polarisation requires that light waves are transverse’ Explain. 3. Explain double refraction through uniaxial crystal. 4. What is difference between positive and negative crystal. 5. Describe the construction and action of Nicol prism and show how it can be used as a polariser or as an analyser. 6. Give three methods for producing plane polarised light. 7. What do you mean by “ordinary ray” and “extraordinary ray”?
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