Doppler Effect on light question

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In "Concepts of modern physics 6/e by arthur beiser", there's a paragraph on pg11 explaining th effec on the observer moving perpendicular to a line between him and the light source. Why is the proper time between ticks to=1/vo?
either i dont understand the question or something, but i dont think the dopler effect can be applied to light.


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Hes talking about relativistic doppler effects.
/relativistic or not
you mean v observer / v source = sqrt((1+b)/(1-b))

where b = v / c and v source = c / lambda source

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