For Young's double slit experiment, two statements are given belo… - Vidyadip

MCQ

For Young's double slit experiment, two statements are given below :

Statement $I:$ If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement $II:$ If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

In the light of the above statements, choose the correct answer from the options given below :

A
Statement $I$ is false but Statement $II$ is true
B
Both Statement $I$ and Statement $II$ are true
C
Both Statement $I$ and Statement $II$ are false
✓
Statement $I$ is true but Statement $II$ is false

✓

Answer

Correct option: D.

Statement $I$ is true but Statement $II$ is false

d
Angular width, $\theta_w=\frac{\lambda}{d}$

$\theta_w$ independent of $D$ but depends on $\lambda$

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