JEE MAIN - Physics (2021 - 24th February Evening Shift - No. 2)
If the source of light used in a Young's double slit experiment is changed from red to violet :
the fringes will become brighter.
the intensity of minima will increase.
consecutive fringe lines will come closer.
the central bright fringe will become a dark fringe.
Explanation
According to Young's double slit experiment, the distance of nth bright fringe from the centre,
$${y_n} = {{n\lambda D} \over d}$$
Since, $${\lambda _{violet}} < {\lambda _{red}}$$
$$\therefore$$ $${y_{violet}} < {y_{red}}$$
$$\therefore$$ Consecutive fringe lines will come closer.
$${y_n} = {{n\lambda D} \over d}$$
Since, $${\lambda _{violet}} < {\lambda _{red}}$$
$$\therefore$$ $${y_{violet}} < {y_{red}}$$
$$\therefore$$ Consecutive fringe lines will come closer.
Comments (0)
