Question

I the spectrum of white light, the two colours at the extreme ends are
violet and red
red and blue
blue and green
red and orange​

Answer 1

Orange and red $\checkmark$

Clarification:

Spectrum is the band of 7 colours of light. Spectrum has these colours in series :

• Violet ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ [1]
• Indigo⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ [2]
• Blue ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀[3]
• Green ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀[4]
• Yellow⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ [5]
• Orange ⠀⠀⠀⠀⠀ ⠀⠀⠀⠀[6]
• Red ⠀⠀⠀⠀⠀⠀⠀⠀ ⠀⠀⠀[7]

So, the two colours at the extreme ends are orange and red.

Tip :

We can learn this colour in serial wise easily by this word :

VIBGYOR

$\red{\star}$ A little further..!

How does a spectrum form?

Spectrum is formed due to refraction of light. Light is mainly made up of 7 colours. So, when 7 colours of light enters in our eyes at the same time together, it gives the impression to see white light.

When this while light enters a different medium, refraction of light occurs. Due to which this light gets separated into 7 colours[spectrum] .