Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringe widths recorded are , and respectively. Then, [2012]

Question

Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringe widths recorded are $b_{G}$ , $b_{R}$ and $b_{B}$ respectively. Then, [2012]

Smart Achievers · Accepted Answer

(4)

We know that fringe width, $β = \frac{λ D}{d}$

$∵$ $λ_{R} > λ_{G} > λ_{B}$

$∴$ $β_{R} > β_{G} > β_{B}$

Solution

Q.
Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringe widths recorded are $b_{G}$ , $b_{R}$ and $b_{B}$ respectively. Then, [2012]

1 $b_{G} > b_{B} > b_{R}$

2 $b_{B} > b_{G} > b_{R}$

3 $b_{R} > b_{B} > b_{G}$

4 $b_{R} > b_{G} > b_{B}$

Ans.
(4)

We know that fringe width, $β = \frac{λ D}{d}$

$∵$ $λ_{R} > λ_{G} > λ_{B}$

$∴$ $β_{R} > β_{G} > β_{B}$

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Solution

Q. Young's double slit experiment is carried out by using green, red and blue light, one colour at a time. The fringe widths recorded are bG, bR and bB respectively. Then, [2012]

1 bG>bB>bR

2 bB>bG>bR

3 bR>bB>bG

4 bR>bG>bB

Ans. (4) We know that fringe width, β=λDd ∵ λR>λG>λB ∴ βR>βG>βB