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    • https://phys.libretexts.org/Courses/Chicago_State_University/PH_S_1150%3A_Basic_Astronomy/18%3A_Knowls/18.00%3A_Big_Ideas_JS_code/18.0.57%3A_wiu_12_1_determining_masses_of_lenses_mass_calculator
      Einstein Ring radius: x 10 radians Distance Source to Observer (Dso): x 10 meters Ratio (Dlo/Dso) x 10 m Mass = 0.00e-16 radians 2 C 2 0.00e-16 0.00e-16 m 4G Mass = 0.000e-16 Kg

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