Question

Indigo and red regions of VIBGYOR, respectively in the range of wavelength
(a) 430-470nm and 660-760nm
(b) 300-390nm and 600-650nm
(c) 390-760nm and 430-470nm
(d) 660-760nm and 430-470nm

Answer 1

Hint: Color gets from the range of light (dissemination of light power versus wavelength) cooperating in the eye with the spectral sensitivities of the light receptors. The color classifications and physical details of color are additionally connected with objects, materials, light sources, and so forth., in view of their physical properties, for example, light ingestion, reflection, or emanation spectra.

Complete step by step answer:
Basically, light is a visible part of electromagnetic radiations and the visible light consists of radiations that have a wavelength between 390 nm - 760 nm (or $3900 \ A^\circ - 7600 \ A^\circ$).

It can be also be resolved into the light of different colors:
violet (390-430 nm)
blue or indigo (430-470 nm)
blue-green or blue (470-500 nm)
green (500-580 nm)
yellow (580-600 nm)
orange (600-650 nm)
orange-red (650-660 nm)
red (660-760 nm).

Additional information: We realize that natural eyes have color detecting capacity yet we don't have the foggiest idea about the specific explanation for this concept. The principal reason is, color is electromagnetic radiation that incorporates different light frequencies. The detectable area in the electromagnetic range is called visible light. There are various classes of shadings like VIBGYOR (Violet tone, Indigo tone, Blue, shading, Green tone, Yellow tone, Orange tone, and red tone). Electromagnetic radiation can be depicted through its wavelength, frequency, and intensity. A large portion of the light sources produces light at various frequencies. At each wavelength, the spectrum of the light source distributes its intensity. The color sensation can be found by the light spectrum which arrives at the human eye.
So, the correct answer is ‘430-470nm and 660-760nm’.

Note: The color of an item relies upon both the material science of the article in its current circumstance and the attributes of the seeing eye and brain. Truly, items can be said to have the color of the light that can be leaving their surfaces, which ordinarily relies upon the spectrum of the incident illumination. Some of the objects not only reflect light but it also transmits light or emits light themselves, which contribute to the color also.