A two-dimensional cavity is investigated experimentally in a laminar hypersonic freestream of Mach number \(M_\infty =6\) . The cavities having a fixed depth of \(D = 4\) mm are mounted on a \(10^\circ \) semi apex-angle wedge with varying cavity lengths (L). Three distinct cavity shear layer characteristics, including open, transitional or closed cavity configurations, are simulated by varying the cavity aspect ratios ( \(L/D = 6, 12, 15\) ). Experiments are carried out at different Reynolds numbers based on cavity depth and cavity upstream flow conditions ( \(27{,}800 \le {\text {Re}}_D \le 90{,}200\) ) to assess the shear layer-related unsteadiness in each case. High-resolution and high-speed schlieren imaging are performed to understand the underlying spatial flow features and associated temporal events. Moreover, unsteady pressure variations are measured on the cavity floor to monitor the recirculation bubble strength. Furthermore, proper orthogonal decomposition is carried out to identify the dominant spatial modes responsible for the unsteadiness. The outcomes offer insights into the cavity recirculation bubble behaviour for a wide range of \({\text {Re}}_D\) .