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Question
Write approximate wavelength for (i) blue (ii) red light. Which colour has the higher speed in a vacuum? Which colour has the higher speed in the glass?
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Solution
(i) The wavelength of blue light is nearly 4600 Å.
(ii) The wavelength of red light is nearly 7900 Å.
Both colours have the same speed in a vacuum. Red light has a higher speed in the glass.
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