Multiple choice

The ratio of refractive index of red light to that of blue light is

  1. less than unity

  2. equal to unity

  3. greater than unity

  4. less as well as greater than unity, depending upon the experimental arrangements
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A Correct answer
Explanation

It is less than unity because refractive index is directly proportional to wavelength of light. Wavelength of light from red to blue decreases, so the refractive index increases. So, the ratio of refractive index of red light to that of blue light is less than unity.

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