Introduction to Light: Basic Concepts

______ is the energy radiated in the form of waves which produces the sensation of vision to the eyes. It may be natural light from sun or the artificial light from the means created by human beings.

______ (E) refers to the intensity of light per unit area and is measured by the normal luminous flux per unit area received by it. It is given by the equation $E = \frac{\Phi},{A}$ where $E$ = illumination, $\Phi$ = luminous flux, and $A$ = area of the surface being illuminated.

______ is part of the electromagnetic radiation spectrum capable of exciting the retina and ultimately producing a visual sensation; it is the wavelengths of electromagnetic radiation to which the human eye is sensitive.

______ is defined as the amount of light leaving an object and is how bright an object appears.

______ (P) is also known as Reflection Factor or Coefficient of Reflection and is given by the ratio of luminous flux reflected from a small area of a surface to the total flux incident upon it.

______ is the energy radiated in the form of waves which produces the sensation of vision to the eyes. It may be natural light from sun or the artificial light from the means created by human beings.

______ is part of the electromagnetic radiation spectrum capable of exciting the retina and ultimately producing a visual sensation; it is the wavelengths of electromagnetic radiation to which the human eye is sensitive.

______ (E) refers to the intensity of light per unit area and is measured by the normal luminous flux per unit area received by it. It is given by the equation $E = \frac{\Phi},{A}$ where $E$ = illumination, $\Phi$ = luminous flux, and $A$ = area of the surface being illuminated.

______ is defined as the amount of light leaving an object and is how bright an object appears.

______ (P) is also known as Reflection Factor or Coefficient of Reflection and is given by the ratio of luminous flux reflected from a small area of a surface to the total flux incident upon it.