Q 31 :

Given below are two statements:

Statement I : In a Young’s double slit experiment, the angular separation of fringes will increase as the screen is moved away from the plane of the slits

Statement II : In a Young’s double slit experiment, the angular separation of fringes will increase when monochromatic source is replaced by another monochromatic source of higher wavelength

In the light of the above statements, choose the correct answer from the options given below:    [2026]

• Statement I is true but Statement II is false

   

• Both Statement I and Statement II are true

   

• Both Statement I and Statement II are false

   

• Statement I is false but Statement II is true

   

Q 32 :

In a Young’s double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m from slits. If a thin transparent sheet of thickness $20\hspace{0.17em}\mu m$ is introduced in front of one of the slits then the bright fringe shifts by 20 mm on the screen. The refractive index of transparent sheet is given by $\alpha /10$ where $\alpha$ is  [2026]