Explain giving reason why the sky appears blue to an observer from the surface of the Earth
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0
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2710
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March 17, 2018
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Why does it take sometime to see objects in a dim room when you enter the room from bright sunlight outside?
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0
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602
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March 17, 2018
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What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise
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0
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8111
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March 17, 2018
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What is meant by ‘persistence of vision’? We are able to see the movie picture in a cinema hall. How does this happen?
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0
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2028
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March 17, 2018
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What is astigmatism? What causes astigmatism? How is astigmatism corrected?
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0
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3587
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March 17, 2018
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What is presbyopia? What causes presbyopia? How is presbyopia corrected?
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0
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3760
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March 17, 2018
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Name the four parts labelled as 1,2, 3 and 4 in the given diagram. At which place is the image of an object formed?
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0
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1276
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March 17, 2018
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How will you use the two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light?
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0
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5935
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March 17, 2018
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Why do different rays deviate differently in the prism?
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0
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5629
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March 17, 2018
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What is the cause of dispersion?
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0
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6596
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March 17, 2018
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What is meant by dispersion of white light? Name the various colours of spectrum of white light in proper sequence
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0
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1405
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March 17, 2018
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Why are ‘danger’ signal lights red in colour?
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0
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1539
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March 17, 2018
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Why there is no dispersion of light refracted through a rectangular glass slab?
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0
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6071
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March 17, 2018
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What is colour-blindness? What kind of retinal cells are lacking in person suffering from this defect?
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0
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2806
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March 17, 2018
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How do we see the colours?
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0
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3845
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March 17, 2018
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