  In this manuscript, we delve into an analytic and numerical probe of shadow
with different accretion models, quasinormal modes, Hawking radiation, and
gravitational lensing to study observational impacts of quantum effect
introduced throughh linear-quadratic GUP(LQG). Our investigation reveals that
the shadows of LQG modified black holes are smaller and brighter than
Schwarzschild black holes. To examine the impact of the quantum correction on
the quasinormal mode, linear-quadratic GUP modified black holes are explored
under scalar and electromagnetic field perturbation. Here, linear-quadratic GUP
is used to capture quantum corrections. It is observed that the incorporation
of quantum correction by linear-quadratic GUP alters the singularity structure
of the black hole. To compute the quasinormal modes of this linear-quadratic
GUP-inspired quantum-corrected black holes, we compute the effective potential
generated under the perturbation of scalar and electromagnetic field, and then
we use the sixth-order WKB approach in conjunction with the appropriate
numerical analysis. We find that the greybody factor decreases with the GUP
parameter $\alpha$ implying that the probability of transmission decreases with
the GUP parameter. The total power emitted by LQG modified black hole is found
to be greater than that emitted by Schwarzschild black hole. Finally, we study
weak gravitational lensing and make a comparison with quadratic GUP and linear
GUP modified black holes.
