Moreover, the major optical behavior of a material is linked with the imaginary part of dielectric function ( 2 ( )) (Eqns. ). The 2 ( ) describes the inter-band transitions by analyzing the major peaks. All the optical interband transitions are essentially due to the orbitals of B, C, and N atoms which can be described by analyzing PDOS (Fig. ). The two major sharper peaks, which arise at 1.90 and 2.90 for unstrained p-BCN in the VR region, justify the first inter-band transitions. In addition, multiple intense peaks are noticed in the UV region, whose intensity is oscillatory with strain. The amplitude of these peaks inappreciably increases (decreases) gradually with increasing tensile (compressive) strain. However, the rate of increment of the intensity of peaks in tensile strain is more than the rate of reduction in compressive strain. These results suggest that multiple rigorous inter-band transitions are created for UV and VR regions. Therefore, the p-BCN monolayer is an optically preferable material for both VR and UV-operated device applications.