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In the work presented here, the impact of magnetic field on the dynamicalevolution of cometary globules Sim 129 and Sim 130 in Sh2-236 H\,II region andthe ionized gas streaming out of their surfaces is investigated. The magneticfield morphology in the region associated with these globules is inferred usingoptical polarization measurements with the Sampurnanand Telescope at ARIES. Thenebular emission is probed through radio continuum mapping at 1.4~GHz with thearchival National Radio Astronomy Observatory (NRAO) very large array (VLA) SkySurvey (NVSS) data. The correlation of these measurements suggest that thephotoevaporated gas from the surfaces of Sim 129 and Sim 130 is accumulated inclouds and starts streaming along the magnetic field lines. The $\rm ^{12}CO$(J=1-0) molecular line observations are performed towards NGC\,1893 from 14-msingle dish radio telescope in Taeduk Radio Astronomy Observatory (TRAO). Thevelocity dispersion in $\rm ^{12}CO$ (J=1-0) molecular line and the dispersionin polarization angles are used in Davis-Chandrasekhar-Fermi formulation toestimate the magnetic field strength towards two sim nebulae. The average valueof field strength is found to be $\sim$60$\mu$G with uncertainty of 0.5 timesthe estimated value.

On the photo-evaporation, dust polarization, and kinematics of two nebulae in Sh2-236