Shadow is formed due to
(a) Rectilinear propagation of light.
(b) Parallel propagation of light.
(c) Passing of light through object
(d) All of these

Shadows are formed because light travels in straight lines. When an opaque object or material is placed in the path of the rays of light, the object blocks the light to pass through it, forming its shadow.


So option a is correct

Regards