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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?
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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