Question

Indigo and red regions of VIBGYOR, respectively fall in the range of wavelength

• A. 430-470 nm and 660-760 nm
• B. 300--390 nm and 600-650 nm
• C. 390-760 nm and 430-470 nm
• D. 660-760 nm and 430-470 nm

Answer 1

Answer: (A)

430-470 nm and 660-760 nm

Light is the visible part of electromagnetic radiations. visible light consists of radiations having a wavelength between 390-760 nm (or 3900-7600 $\mathring{A}$) It can 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).

So the correct answer is '430-470 nm and 660-760 nm'.