Question

(iii) Which colour is seen at the bottom of the rainbow?
(a) red
(b) green
(c) yellow
(d) violet​

Answer 1

Answer:

green

Explanation:

muja branliest bana na mat vulna

Answer 2

$\sf{\huge{\underline{\red{Answer :-}}}}$

$\mathtt{\large{\bf{\purple{Option.D)Violet}}}}$

In VIBGYOR , Voilet is at bottom because of small wavelength.

$\sf{\huge{\underline{\pink{About\:It :-}}}}$

• Dispersion of light is the phenomenon of splitting of white light into its constituent seven colours on passing through a glass prism. The band of seven colours so obtained is called a visible spectrum. The colour sequence in the spectrum from the lower end is given by acronym VIBGYOR, where V stands for violet I for indigo ; B for blue, G for green: Y for yellow O for orange and R for red.

• Every colour has its own characteristic wavelength/frequency. Different colours move with the same speed in air/vacuum. But their speeds in refracting medium like glass are different. Therefore, refractive index of the medium for different colours is different . As a result, different colours undergo different deviations on passing through the prism.Hence different colours emerge from the prism along different directions. This is the cause of dispersion.

• When waves pass white light through two identical prisms held side by side with their refracting edges in opposite directions the first prism disperses white light into seven colours and the second prism recombines the seven colours into white light. Thus light emerging from 2nd prism is white.

• Rainbow is a beautiful example of dispersion of white light in nature Sunlight disperses on passing through tiny droplets of water suspended in air during or after a shower.

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