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Wave Optics
Question
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What is a polaroid?

Answer

Polaroid is a thin and large sheet made of crystalline polarising material, which produces plane polarised beam of light.

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Some More Questions From Wave Optics Chapter

What is the shape of the wavefront in each of the following cases:
The portion of the wavefront of light from a distant star intercepted by the Earth. 

Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?