Question

how is diffraction possible?

Answer 1

Diffraction refers to various phenomena which occur when a wave encounters an obstacle or a slit. In classical physics, the diffraction phenomenon is described as the interference of waves according the Huygens Fresnel principle.

Answer 2

Because of the superposition(or interference) of waves.
Or u can think that's how the waves work.

Answer 3

Diffraction is defined as the deviation from rectilinear propagation is explained with the wave theory of light is two types fraunhofer and Fresnel

Answer 4

diffraction can be observed using a light beam placing in front of a grating slit or aperture and taking the beam in a screen and measuring the intensity variation or we can see them in the shadow as light beam coming from any source or even from sun when obstructed produce shadow but the edge of the shadow is not as dark as it ought to be but we see little light due to secondary wavelet at the age of the object interfere to produce the diffraction pattern