Shadows are formed when opaque objects obstruct the path of light. Image is seen when light comes from the object after reflection or refraction enters the observer's eye. No light enters the eye from the shadow of the object. Image gives more information such as colour, structure, etc.

Introduction:
Light, shadows, and reflections are fundamental concepts in the study of optics. Understanding their differences is crucial in comprehending how light behaves and interacts with objects.

Difference between Shadow and Image:
1. Definition:
- Shadow: A shadow is a dark area or shape formed by an object blocking the path of light.
- Image: An image is a representation of an object formed by rays of light either passing through it or reflected from it.

2. Formation:
- Shadow: Shadows are formed when light is blocked by an object. A shadow appears on the opposite side of the object, away from the light source.
- Image: Images are formed either by light passing through an object or by light reflecting off an object. They appear on the same side as the object, close to the light source.

3. Visibility:
- Shadow: Shadows are often visible and can be easily observed. They are darker than the surroundings due to the absence of light.
- Image: Images may or may not be visible, depending on various factors such as the reflectivity or transparency of the object. They can be formed on surfaces or captured by cameras.

4. Characteristics:
- Shadow: Shadows have distinct shapes and sizes, which vary depending on the position of the light source, the object, and the surface on which the shadow falls.
- Image: Images can be real or virtual. Real images can be captured on a screen and have the same orientation as the object. Virtual images cannot be captured and appear to be behind or inside the object.

5. Interaction with Objects:
- Shadow: Shadows interact with objects, blending with their outlines and contours. They can change shape, size, and intensity based on the position and properties of the object.
- Image: Images do not interact with objects. They are merely a representation of the object and can be altered or distorted by lenses or mirrors.

Conclusion:
In summary, shadows are dark areas formed by the blocking of light, appearing on the opposite side of the object. On the other hand, images are representations of objects formed by light passing through or reflecting off them, appearing on the same side as the object. While shadows interact with objects and can be observed directly, images are passive representations that can be captured or manipulated.