Object

An object is a material thing that can be seen and touched.

  • An object is intuitively assumed to exist and to be responsible for a unified experience, consisting of visual and other sensations and perceptions.
  • Every object, whether a material, medium or substance, is made of matter of one kind or another.
  • The key differentiating factor between objects is the atoms, molecules and compounds they are constructed from.

An object is a material thing that can be seen and touched.

  • An object is intuitively assumed to exist and to be responsible for a unified experience, consisting of visual and other sensations and perceptions.
  • Every object, material, medium or substance that we can see is made of matter of one kind or another. The key differentiating factor is the elements and molecules they are constructed from.
  • You will have come across the elements that make up the periodic table.
  • A close look at molecules reveals that they are made up of atoms composed of electrons surrounding a nucleus of protons and electrons.
  • Light illuminates objects. In a nutshell, different elements and molecules react to light in different ways because of their atomic structure and the particular way they combine to form mixtures or compounds.
  • In the case of an opaque object, it is the molecules that form its surface that determine what happens when light strikes it. Translucent and transparent objects behave differently because light can travel through them.
  • Another factor that needs to be taken into account when light strikes an object is surface finish. A smooth and polished surface behaves differently from one that is rough, textured or covered in ripples.
Is a rainbow an object?
The colour of objects
  • Objects are composed of atoms, molecules, elements and compounds that react to light in different ways because of their atomic structure and composition.
  • Objects appear to be different colours to an observer depending on the wavelengths, frequencies and intensity of light at the moment it strikes the retina at the back of the eye.
  • In the case of opaque objects, it is their surface that determines what happens when they are exposed to light.
  • Translucent and transparent objects behave differently because light can travel through them.
  • The surface finish of objects affects their appearance. Smooth and polished (specular) surfaces behave differently from those that are rough, textured or rippled.