Formation of shadows can be explained by A. Rectilinear propagation of light B. Reflection C. Refraction D. Total internal reflection

The correct answer is A. Rectilinear propagation of light.

Light travels in straight lines. When an object blocks light, a shadow is formed on the opposite side of the object. The shape of the shadow depends on the shape of the object.

Reflection is the bouncing of light

off a surface. Refraction is the bending of light as it passes from one medium to another. Total internal reflection is the phenomenon that occurs when light passes from a medium with a higher refractive index to a medium with a lower refractive index at an angle greater than the critical angle.

In the case of shadows, reflection and refraction do not play a role. The shadow is formed because light travels in straight lines and is blocked by the object.