Question

why does intensity of secondary maxima becomes less as compared to the central maximum​

Answer 1

Answer:

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Explanation:

It is because, the intensity of the central maximum is due to wavelets from all parts of the slit, the first secondary maximum is due to wavelets from one third part of the slit only, the second secondary maximum is due to the wavelets from the fifth part only and soon.

Answer 2

Answer:

It is because, the intensity of the central maximum is due to wavelets from all parts of the slit, the first secondary maximum is due to wavelets from one third part of the slit only, the second secondary maximum is due to the wavelets from the fifth part only and soon.