Q1 of 79 Page 380

Find the range of frequency of light that is visible to an average human being (400 nm < λ < 700 nm).

We know that the velocity of light(c) is related with the frequency () and wavelength () of light as



Now, speed of light is


Minimum wavelength ,


Associated frequency,


Maximum wavelength ,


Associated frequency,


Hence the range of the frequency is to


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The wavelength of sodium light in air is 589 nm. (a) Find its frequency in air. (b) Find its wavelength in water (refractive index = 133). (c) Find its frequency in water. (d) Find its speed in water.

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The index of refraction of fused quartz is 1.472 for light of wavelength 400 nm and is 1.452 for light of wavelength 760 nm. Find the speeds of light of these wavelengths in fused quartz.