Question

7. What do you understand by 'spectrum and how can you obtain it on a white screen?​

Answer 1

Explanation:

Spectrum is the band of colours obtained on a screen when white light passes through a prism and splits into its constituent colours. The colours of the spectrum are violet, indigo, blue, green, yellow, orange and red {VIBGYOR}

It can be obtained by a real image

Answer 2

Answer:

A set of seven colors namely yellow,red,orange,green,blue,indigo and violet is known as a spectrum. We can get a spectrum through triangular piece of glass known as prism. when a beam of light  passes through a prism, it splits into seven colors of the spectrum.