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ICSE Class 10 Physics 2020 Paper

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The wave length for the light of red and blue colours are nearly 7.8×10−7 m7.8 \times 10^{-7}\,\mathrm{m} and 4.8×10−74.8 \times 10^{-7} m\mathrm{m} respectively.
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Question : 16 of 67
Marks: +1, -0
Which colour has a greater speed in glass?
Solution:  
Red colour has a greater speed in glass.
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