Respuesta :
Answer;
- Diffraction
The fuzzy edges of shadows are a result of diffraction.
Explanation;
The edge of a shadow is fuzzy due to the effects of the light being diffracted by the edge of the object that it is illuminating.
Penumbra is the region in which only a portion of the occulting body is obscuring the light source. Thus, the penumbra of a shadow is fuzzy due to the effect of 'knife edge' diffraction and shows small fringes near its edges if the diffracting edge is sharp enough and the light source is monochromatic.
