The figure shows the interference pattern obtained in a double-slit experiment u

Question

The figure shows the interference pattern obtained in a double-slit experiment using light of wavelength 600 NM

Which of the following phenomena would be observed if the wavelength of light were increased?

select one:

A. The distance between dark fringes would decrease.

B. More bright fringes would appear on the screen.

C. Single-slit diffractions effects would become non-negligible

D. The angular seperation between bright fringes would increase

E. The fringes would be brighter

Explanation / Answer

distance between each bright fringe=wavelength*D/d

so if wavelength is increased ,the separation between fringe will increase so less number of bright fringe and angular separation between bright fringe will increase so option(D) is correct

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