shadow
Definition
A shadow is a dark area that is created when an object blocks light. It is the absence of light.
Shadows are formed when light rays from a light source are blocked by an opaque object. The light rays that are blocked do not reach the surface behind the object, creating a dark area called a shadow.
The size and shape of a shadow depend on the size and shape of the object, the distance between the object and the light source, and the angle of the light rays.
The sun is a natural light source that creates shadows. The moon can also create shadows when it passes in front of the sun during a lunar eclipse.
Shadows are used in many different ways. They can be used to create art, to measure distances, and to tell time.
How can the word be used?
The actor's shadow loomed large on the stage.
Different forms of the word
Noun:
- a dark area or shape produced by a body coming between rays of light and a surface.
- a person's reputation or influence.
- a feeling of sadness or gloom.
Verb:
- to cast a shadow on something.
- to darken or obscure something.
- to follow or pursue someone closely.
Etymology
The word "shadow" comes from the Old English word "sceadow", which also means "shadow".
The first recorded use of the word "shadow" in English was in the 8th century.
The word "shadow" is an Old English word, and it is related to the German word "Schatten" and the Dutch word "schaduw".
Question
When are shadows at their longest?
AQA Science Exam Question and Answer
Question:
Explain the formation of shadows and how they are influenced by the position of a light source, the object casting the shadow, and the surface on which the shadow is cast.
Answer:
Shadows are formed when an object blocks the path of light from a source, leading to a region of reduced or no light behind the object. The position of a light source, the object casting the shadow, and the surface on which the shadow falls all influence the characteristics of the shadow.
The angle and intensity of the light source affect the length and direction of the shadow. A higher angle of light creates longer shadows, while a lower angle produces shorter ones. The shape and size of the object casting the shadow determine the shadow's shape and sharpness.
The surface on which the shadow is cast can also influence its appearance. A smooth, flat surface produces a well-defined shadow, while an uneven or textured surface may distort the shadow's shape.
Additionally, the presence of multiple light sources can create multiple shadows with varying degrees of darkness and direction.
Shadows have applications in various fields, such as art, photography, and architecture. By studying shadows, we gain insights into the behaviour of light and how it interacts with objects and surfaces, contributing to our understanding of optics and enabling creative and practical uses of lighting and design.