Question

Name color/s of the spectrum of white light which have wavelength longer than blue light.

• A. Green
• B. Yellow
• C. Red
• D. All the above

Answer 1

The correct option is D All the above

White light is made of seven color band (VIBGYOR), such that the white light is incident on the refracting face of the prism each coloured ray deviates through different angle, depending upon its wavelength. The red rays deviate least and the maximum wavelength, whereas the violet rays deviate most and the minimum wavelength. It is this differential deviation of rays, which causes dispersion. The colors of light that has a longer wavelength than blue light are green, yellow, orange and red.
Dispersion of white light is shown below.