Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringewidths recorded are W G , W R and W B respectively. Then

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Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringewidths recorded are W G ​ , W R ​ and W B ​ respectively. Then

TestHub · Accepted Answer

The fringe width in Young's double slit experiment is given by $W = \frac{λ D}{d}$ .

For a given experimental setup, $D$ and $d$ are constant, so $W \propto λ$ .

The wavelengths of red, green, and blue light follow the order $λ_{R} > λ_{G} > λ_{B}$ .

Therefore, the corresponding fringe widths will be in the order $W_{R} > W_{G} > W_{B}$ .

Answer: $W_{R} > W_{G} > W_{B}$

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