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Last Updated On 01-06-2023 - By Jeesha Sara

Three waves of equal frequency having amplitudes  arrive at a given point with successive phase difference of , the amplitude of the resulting wave in  is given by


Question ID - 150082 :-

Three waves of equal frequency having amplitudes  arrive at a given point with successive phase difference of , the amplitude of the resulting wave in  is given by

1 Answer
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Answer Key : (5) -

The amplitudes of the waves are

 and

and the phase difference between 1st and 2nd wave is  and that between 2nd and 3rd is . Therefore, phase difference between 1st and 3rd is . Combining 1st with 3rd, their resultant amplitude is given by

Or

 in the direction of first

Now combining this with 2nd wave we have, the resultant amplitude

Or



Next Question :

An unpolarised beam of intensity  passes through a thin Polaroid. Assuming zero absorption in the Polaroid, the intensity of emergent plane polarized light is

a)

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