Both red and blue light are simultaneously incident on a pair of slits separated

Question

Both red and blue light are simultaneously incident on a pair of slits separated by a distance, d. Diffraction patterns are observed on a screen a distance, L, from the slits. Which of the following statements could be TRUE? (Pick one)

A) The red and blue fringers alternate positions (i.e. red spot, blue spot, red spot, blue spot).

B) The 2nd order blue fringe could be located at the position of the first order red fringe.

C) The first order red and blue fringes are at the same position.

D) The 2nd order red fringe could be located at the position of the first order blue fringe.

Explanation / Answer

B) The 2nd order blue fringe could be located at the position of the first order red fringe.

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