Question

A beam of white light splits in to its constituent colours when passed through a glass prism and also when it is passed through a grating, which one of the following statements are true ?

• A. The most deviated colour is red in both cases.
• B. The most deviated colour is violet in both cases
• C. Red is most deviated and violet is least deviated in prism spectra
• D. Red is most deviated and violet is least deviated in grating spectra

Answer 1

Answer:

D. Red is most deviated and violet is least deviated in grating spectra

• Prism Spectrum are formed because of the dispersion of light, the Grating Spectrum is formed because of the diffraction of light.
• The colors of the spectrum produced by a diffraction grating are in reverse order to those of a prism
• In grating spectrum, red color is deviated (diffracted) most and violet least.