Detection of extremely low frequency gravitational wave using gravitational lens

The effect of gravitational wave cosmological wavelength on the lensing is investigated. When source, deflector, and observer are aligned in a highly symmetric configuration, an Einstein ring will be observed by observer. There no time delays between different locations absence wave. Otherwise, emerge if propagates through system. Previous studies demonstrated that delay resulting from source-deflector-observer configuration presence could equivalent to similar lens with nonaligned Results this work show serve as potential detector when whole taken into account.