Question

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 remians 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
• D. Statement I is true but Statement II is false

Answer 1

Answer: (D)

Statement I is true but Statement II is false

Answer 2

The correct option is (D): Statement I is true but Statement II is false

Angular width, $\theta _w=\frac{\lambda}{d}$

$\theta_w$ independent on d but dependent on $\lambda$