Physics 2015 JAMB Past Questions - Question 37: he sharpness of the boundary of the shadow of an object is determined by the

Correct Answer

B

Explanation

various factors, including the size of the light source, the distance between the object and the surface on which the shadow is cast, and the shape of the object itself.

When the light source is small or far away, the shadow's boundary tends to be more defined and sharp. This is because the light rays from the source are more parallel, resulting in a clear distinction between the illuminated and shaded areas.

On the other hand, if the light source is large or close to the object, the shadow's boundary becomes less distinct and more diffused. This is because the light rays from the source diverge, causing a gradual transition between the illuminated and shaded regions.

Additionally, the shape of the object can also affect the sharpness of the shadow's boundary. Objects with smooth and uniform surfaces tend to produce sharper shadows, while objects with irregular or rough surfaces may create softer and less defined shadow edges.

In summary, the sharpness of the boundary of a shadow is influenced by the size and distance of the light source, as well as the shape and surface characteristics of the object casting the shadow.