Question

(a) What is the spectrum? What is the name of the glass shape used to produce a spectrum? (b) How many colours are there in a full spectrum of white light? Write the various colours of the spectrum in the order, starting with red.

Answer 1

Hint: A spectrum is a collection of seven colors produced when a beam of white light is transferred through a transparent glass prism. To provide a spectrum of white light, a triangular glass prism is utilized. Visible wavelengths transfer primarily unattenuated by the Earth's atmosphere through the "optical window" area of the electromagnetic spectrum.

Complete step-by-step solution:
A spectrum is a form that is not restricted to a specific set of values but can change, without steps, over a continuum. It is used reliably in optics to define the rainbow of colors in visible light after moving through a prism. A systematic understanding of light advanced, it began to apply to the entire electromagnetic spectrum. It thereby became a mapping of a range of wavelengths to a range of features, which are the recognized "colors of the rainbow" and other characteristics compared to wavelengths that lie outside the visible light spectrum.
The spectrum does not receive all the colors that the human visual system can identify. Unsaturated colors such as pink, or purple varieties like magenta, for example, are lost because they can only be formed from a mix of various wavelengths. Colors comprising only one wavelength are also termed spectral colors.
The visible spectrum is the section of the electromagnetic spectrum that is apparent to the human eye. Electromagnetic radiation in this series of wavelengths is named visible light. An average human eye will respond to wavelengths from approximately $400$ to about $700$ nanometres.
To provide a spectrum of white light, a triangular glass prism is utilized.
b) A spectrum contains $7$ colours:
Red, Orange, Yellow, Green, Blue, Indigo, Violet

Note: When clean air diffuses, blue light is higher than red light, so the midday sky seems blue. The optical window is also related to the "visible window" because it overlays the human visible acknowledgment spectrum. The near-infrared window extends beyond the human vision, the medium wavelength infrared window, and the long-wavelength or far-infrared window, although other animals may feel them.