Question

s the colour of 620 nm light and 780 nm light same? Is the colour of 620 nm light and 621 nm light same? How many colours are there in white light?

Answer 1

As we know that White light consist of 7 different colours .

These are violet, indigo, blue, green, yellow, orange and red, collectively known as VIBGYOR

Spectrum of white light consists of  sever colour bands arranged in decreasing order of wavelength.

Spectrum of visible  light contains  350nm[ violet ] to 700 nm [Red].

Every colour has its own wavelength.

For orange colour : (590 nm to 620 nm)

For red colour: (620 nm to 780 nm)

So, the colour of 620 nm and 780 nm lights may be different. But the colour of 620 nm light and 621 nm light is same.

Answer 2

NO , the colour of light 620 nm and 780 nm are very different .

This is because colour of light depends on the wavelength of light .

For different wavelengths of light , the colour is different .

There are 7 colours in white light .

They are as follows :

⇒ Violet

⇒ Indigo

⇒ Blue

⇒ Green

⇒ Yellow

⇒ Orange

⇒ Red

This can be remembered by using the word VIBGYOR .