Dark

Dark is a term that is often used to describe the absence of light or the presence of shadow. It can also refer to a color that is closer to black than white, or to a time of day when the sun is not visible. In a broader sense, the term "dark" can also be used metaphorically to describe something that is mysterious, unknown, or ominous.

Physical properties

In the physical world, darkness is the result of the absence of visible light. This can occur naturally, such as during the night when the sun is not visible, or it can be artificially created by blocking out light sources. The degree of darkness can vary depending on the amount of light that is blocked out.

Perception of darkness

The human eye perceives darkness when the photoreceptor cells in the retina do not receive enough light to stimulate them. This can occur in low-light conditions, or when the eyes are closed. The perception of darkness can also be affected by other factors, such as the presence of other light sources, the color and brightness of surrounding objects, and the individual's own visual acuity.

Symbolism and cultural significance

In many cultures, darkness is often associated with mystery, the unknown, and sometimes with evil or fear. This is reflected in many forms of literature, art, and folklore. However, darkness can also be seen as a symbol of tranquility, peace, and rest, as it is during the night that most people sleep.

See also

• Light
• Shadow
• Color
• Night
• Photoreceptor cell
• Retina
• Visual acuity

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