The correct arrangement of colours in the descending order of their w…

The correct answer is Option (1) → E, B, C, A, D

In the visible spectrum the wavelength decreases from red to violet. The approximate wavelength ranges are:

    E. Red: about 620–750 nm
    B. Orange: about 590–620 nm
    C. Yellow: about 570–590 nm
    A. Green: about 495–570 nm
    D. Violet: about 380–450 nm

The descending order of wavelength is E, B, C, A, D.

Shortcut: VIBGYOR runs from violet to red in increasing wavelength, so reading it backwards (red, orange, yellow, green, blue, indigo, violet) gives the descending order. Leaving out blue and indigo, which are not in the list, this is directly E, B, C, A, D.

Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), but it is still in the CUET 2026 syllabus, so do not skip it.

NCERT (Pre-rationalised edition, 2022-23):
Dispersion by a Prism – “… There is actually a continuous variation of colour, but broadly, the different component colours that appear in sequence are: violet, indigo, blue, green, yellow, orange and red (given by the acronym VIBGYOR).”

Dispersion by a Prism – “… We now know that colour is associated with wavelength of light. In the visible spectrum, red light is at the long wavelength end (~700 nm) while the violet light is at the short wavelength end (~ 400 nm).”