Question

When is a shadow formed ?​

Answer 1

Answer:

When the rays reach Earth, they hit whatever is in their path. If the object they hit is opaque, the light cannot pass through, and a shadow forms. Simply speaking, a shadow is an absence of light.

Answer 2

$\underline \color{cyan}ANSWER$

A shadow is formed when light strikes an opaque object and its not able to pass through it, therefore it appears dark on the other side of the opaque object and forms a shadow.