If GW is electromagnetic wave type as the LIGO used the Interferometer to detect its presence by a frequency shift. But in the case of light, the same interferometer was used by Michelson-Morley and got null result. The only difference between them: LIGO assumed the contraction and expansion of fabric in linearity and expected to obtain a wavelength variance while MM was based on same principle but such wavelength variance was tried to be created by path difference. This shows the tendency of LIGO doesn't belong to true mechanism. So, if the expected result was true in experiment got by LIGO, it will question on fundamental nature of GW, how to mention the existence nature of GW?

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