For Young's double slit experiment, two statements are given below:Statement I: If the screen is moved away from the plane of slits, the 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:
- ABoth Statement I and Statement II are true.
- BBoth Statement I and Statement II are false.
- CStatement I is true but Statement II is false.
- DStatement I is false but Statement II is true.
Solution & Step-by-step Explanation
The angular separation of the fringes is given by:
where is wavelength and is slit separation.Statement I is true: does not depend on the distance between the slits and the screen. So, moving the screen does not affect it.Statement II is false: As , increasing the wavelength will increase the angular separation, not decrease it.
where is wavelength and is slit separation.Statement I is true: does not depend on the distance between the slits and the screen. So, moving the screen does not affect it.Statement II is false: As , increasing the wavelength will increase the angular separation, not decrease it.